US20060163641A1 - Insulation film semiconductor device and method - Google Patents
Insulation film semiconductor device and method Download PDFInfo
- Publication number
- US20060163641A1 US20060163641A1 US11/266,988 US26698805A US2006163641A1 US 20060163641 A1 US20060163641 A1 US 20060163641A1 US 26698805 A US26698805 A US 26698805A US 2006163641 A1 US2006163641 A1 US 2006163641A1
- Authority
- US
- United States
- Prior art keywords
- formation region
- film
- transistor
- gate
- semiconductor substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/823462—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type with a particular manufacturing method of the gate insulating layers, e.g. different gate insulating layer thicknesses, particular gate insulator materials or particular gate insulator implants
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/823418—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type with a particular manufacturing method of the source or drain structures, e.g. specific source or drain implants or silicided source or drain structures or raised source or drain structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/823493—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type with a particular manufacturing method of the wells or tubs, e.g. twin tubs, high energy well implants, buried implanted layers for lateral isolation [BILLI]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823814—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the source or drain structures, e.g. specific source or drain implants or silicided source or drain structures or raised source or drain structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823857—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the gate insulating layers, e.g. different gate insulating layer thicknesses, particular gate insulator materials or particular gate insulator implants
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/822—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
- H01L21/8232—Field-effect technology
- H01L21/8234—MIS technology, i.e. integration processes of field effect transistors of the conductor-insulator-semiconductor type
- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823892—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the wells or tubs, e.g. twin tubs, high energy well implants, buried implanted layers for lateral isolation [BILLI]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
- H01L21/82—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
- H01L21/84—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being other than a semiconductor body, e.g. being an insulating body
Definitions
- This relates to a semiconductor device and method of manufacture of a semiconductor device having at least two transistors with different gate insulation film thicknesses.
- MOSFET metal-oxide-semiconductor field-effect transistors
- high voltage transistors are used that can be driven with voltages of 10-20 V, or more (hereinafter referred to as “high voltage transistors”).
- FIG. 7 is a cross section view of a semiconductor device having high and low voltage (that is, high voltage-rated and low voltage-rated) transistors according to a conventional configuration.
- FIG. 7 shows high voltage PMOS and NMOS transistors Tr 1 , Tr 2 and low voltage PMOS and NMOS transistors Tr 3 , Tr 4 , formed on a p-type semiconductor substrate 101 .
- semiconductor substrate 101 the regions of transistors Tr 1 , Tr 2 , Tr 3 and Tr 4 are separated from each other by means of element-separating insulator film 102 .
- n-type well 111 , p-type drain region 112 , and p + -type drain region 113 are formed in semiconductor substrate 101 .
- p + -type source region 114 is formed on the surface of n-type well 111 , and the portion between p-type drain region 112 and p + -type source region 114 becomes the channel-formation region.
- n + -type back gate 115 is formed adjacent to the side opposite to the channel-formation region of p + -type source region 114 .
- gate-insulation film 116 is formed to cover the channel-formation region, and gate electrode 117 is formed as the upper layer on it. This arrangement forms the high voltage PMOS transistor Tr 1 .
- n-type drain region 121 and n + -type drain region 122 are formed in semiconductor substrate 101 .
- n + -type source region 123 is formed on the surface of semiconductor substrate 101 , and the portion between n-type drain region 121 and n + -type source region 123 becomes the channel-formation region.
- p + -type back gate 124 is formed adjacent to the side opposite the channel-formation region of n + -type source region 123 .
- gate-insulation film 125 is formed to cover the channel-formation region, and gate electrode 126 is formed as the upper layer on it. This arrangement forms the high voltage NMOS transistor Tr 2 .
- n-type well 131 is formed in semiconductor substrate 101 .
- a pair of p + -type source/drain regions 132 are formed separated from each other by a prescribed distance, and the region between them becomes the channel-formation region.
- gate-insulation film 133 is formed to cover it, and gate electrode 134 is formed as the upper layer on it. This forms the low voltage PMOS transistor Tr 3 .
- n + -type source/drain regions 141 are formed on the surface of semiconductor substrate 101 , separated from each other by a prescribed distance, and the region between them becomes the channel-formation region. Also, gate-insulation film 142 is formed to cover it, and gate electrode 143 is formed as the upper layer on it. This forms the low voltage NMOS transistor Tr 4 .
- the various regions on semiconductor substrate 1 are allotted to formation region R 1 of high voltage PMOS transistor Tr 1 , formation region R 2 of high voltage NMOS transistor Tr 2 , formation region R 3 of low voltage PMOS transistor Tr 3 , and formation region R 4 of low voltage NMOS transistor Tr 4 , and the divided regions will be explained.
- n-type well 111 , p-type drain region 112 , n-type drain region 121 , and n-type well 131 are formed on semiconductor substrate 101 by means of ion implantation, etc. Then, for example, a silicon oxide film or other insulating film 102 a is formed on the entire surface. Then, as shown in FIG. 8B , insulating film 102 a is subjected to patterning processing to form element-separating insulator films 102 . Then, as shown in FIG. 9A , thermal oxidation treatment is performed on the entire surface to form gate-insulation film 116 in high voltage PMOS transistor formation region R 1 .
- insulating film 116 a is formed on the surface of semiconductor substrate 101 in high voltage NMOS transistor formation region R 2 and low voltage PMOS and NMOS transistor formation regions R 3 , R 4 . Then, as shown in FIG. 9B , a pattern of a resist film is formed, and openings are formed on insulating film 116 a of high voltage NMOS transistor formation region R 2 , and low voltage PMOS and NMOS transistor formation regions R 3 , R 4 , followed by etching treatment to remove the insulating film 116 a . Next, as shown in FIG.
- thermal oxidation treatment is performed on the entire surface to form gate-insulation films 125 , 133 , 142 in high voltage NMOS transistor Tr 2 formation region R 2 , low voltage PMOS transistor Tr 3 formation region R 3 and low voltage NMOS transistor Tr 4 formation region R 4 . Then, as shown in FIG.
- gate electrodes ( 117 , 126 , 134 , 143 ) are formed on gate insulated films ( 116 , 125 , 133 , 142 ) on high breakthrough PMOS transistor (Tr 1 ) forming region R 1 , high breakthrough NMOS transistor (Tr 2 ) forming region R 2 , low breakthrough PMOS transistor (Tr 3 ) forming region R 3 , and low breakthrough NMOS transistor (Tr 4 ) forming region R 4 , respectively.
- gate electrode, resist film, etc. are used as masks for ion implantation to form source/drain regions connected to the channel-formation regions of the various transistor formation regions.
- the step height of the element-separating insulator film becomes larger. If such an element-separating insulator film is used as is in the low voltage transistors, it becomes difficult to realize smaller transistors and a higher integration degree for logic MOS transistors, etc. that have an especially higher element density.
- the invention provides a semiconductor device comprising, in a described implementation, a semiconductor substrate; a first element-separating insulator film that is formed and selectively left on the semiconductor substrate so as to perform element separation for the first transistor-formation region; a second element-separating insulator film that is formed by selective oxidation of the surface layer of the semiconductor substrate so as to perform element separation for the second transistor-formation region; a first transistor that is formed in the region separated by the first element-separating insulator film and has a first channel-formation region and a first source/drain region formed on the semiconductor substrate, a first gate-insulation film with a first film thickness formed on the first channel-formation region, and a first gate electrode formed on the first gate-insulation film; and a second transistor that is formed in the region separated by the second element-separating insulator film and has a second channel-formation region and a second source/drain region formed on the semiconductor substrate, a second gate-insulation film with a second film thickness less than the first film thickness and formed on the second channel-formation
- the first transistor-formation region is selectively left on the semiconductor substrate so that element separation is realized, and the first element-separating insulator film is formed.
- the surface layer portion of the semiconductor substrate is selectively oxidized so that element separation is realized for the second transistor-formation region, and the second element-separating insulator film is formed.
- the first transistor composed of the first channel-formation region and first source/drain region formed on the semiconductor substrate, the first gate-insulation film with the first film thickness formed on the first channel-formation region, and the first gate electrode formed on the first gate-insulation film
- the second transistor composed of the second channel-formation region and second source/drain region formed on the semiconductor substrate, the second gate-insulation film with a second film thickness less than the first film thickness and formed on the second channel-formation region, and the second gate electrode formed on the second gate-insulation film.
- the first gate-insulation film and the second element-separating insulator film have substantially the same film thickness.
- the first transistor be a high voltage transistor and the second transistor be a low voltage transistor.
- a back gate region be formed adjacent to the first source/drain region. It is also preferred that a transistor of the first electroconductive type and a transistor of the second electroconductive type be formed.
- the following scheme is preferred: In the region separated by the first element-separating insulator film, there is also a third transistor that has a third channel-formation region and a third source/drain region formed on the semiconductor substrate, a third gate-insulation film with a film thickness less than the first film thickness and formed on the third channel-formation region, and a third gate electrode formed on the third gate-insulation film.
- the semiconductor substrate be a substrate having an SOI (semiconductor on insulator) structure having a semiconductor layer on an insulating film on the substrate. It is even more preferred that on the substrate of the SOI structure, the region of the semiconductor layer where the first transistor be formed is individually insulated and separated by an insulating layer formed from the surface of the semiconductor layer to reach the insulating film.
- SOI semiconductor on insulator
- the invention also provides a method for manufacturing semiconductor devices comprising, in a described implementation, a step in which the first transistor-formation region of the semiconductor substrate having the first channel-formation region is selectively left for element separation to form the first element-separating insulator film; a step in which the surface layer portion of the semiconductor substrate is selectively oxidized for element separation of the second transistor-formation region of the semiconductor substrate having the second channel-formation region to form the second element-separating insulator film; a step in which the first gate-insulation film with the first film thickness is formed on the surface of the semiconductor substrate in the first transistor-formation region; a step in which the second gate-insulation film with the second film thickness less than the first film thickness is formed on the surface of the semiconductor substrate in the second transistor-formation region; a step in which the first gate electrode is formed on the first gate-insulation film, and the second gate electrode is formed on the second gate-insulation film; and a step in which the first source/drain region connected to the first channel-formation region is formed, and the second source/drain
- the first transistor-formation region of the semiconductor substrate having the first channel-formation region is selectively left for element separation to form the first element-separating insulator film.
- the surface layer portion of the semiconductor substrate is selectively oxidized for element separation of the second transistor-formation region of the semiconductor substrate having the second channel-formation region to form the second element-separating insulator film.
- the first gate-insulation film with the first film thickness is formed on the surface of the semiconductor substrate in the first transistor-formation region; then the second gate-insulation film with the second film thickness less than the second film thickness is formed on the surface of the semiconductor substrate in the second transistor-formation region.
- the first gate electrode is formed on the first gate-insulation film, and the second gate electrode is formed on the second gate-insulation film. Then, the first source/drain region connected to the first channel-formation region is formed, and the second source/drain region connected to the second channel-formation region is formed.
- the step of forming the first element-separating insulator film includes the following operation steps: a step in which an insulating film is formed on the entire surface of the semiconductor substrate, a step in which the first mask layer for protecting the formation region of the first element-separating insulator film is formed on the insulating film, and a step in which the first mask layer is used to perform patterning processing for the insulating film so as to selectively leave it in the formation region of the first element-separating insulator film to form the first element-separating insulator film.
- the step of forming the second element-separating insulator film includes the following operation steps: a step in which the second mask layer protecting the region excluding the formation region of the second element-separating insulator film is formed on the semiconductor substrate, and a step in which the surface layer portion of the semiconductor substrate in the formation region of the second element-separating insulator film exposed from the second mask layer is selectively oxidized to form the second element-separating insulator film.
- the step of forming the first gate-insulation film contain the following operation steps: a step in which the first gate-insulation film is formed, a step in which the second mask layer protecting the region excluding the first transistor-formation region is formed on the semiconductor substrate, and a step in which the surface layer portion of the semiconductor substrate in the first transistor-formation region exposed from the second mask layer is selectively oxidized to form the first gate-insulation film.
- FIG. 1 is a cross-sectional view of a semiconductor device according to a first embodiment of the present invention.
- FIGS. 2A and 2B are cross-sectional views illustrating the steps of manufacturing of the semiconductor device in the first embodiment of the present invention.
- FIGS. 3A and 3B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the first embodiment of the present invention.
- FIGS. 4A and 4B are cross-sectional views illustrating the steps of manufacturing of the semiconductor device in the first embodiment of the present invention.
- FIGS. 5A and 5B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the first embodiment of the present invention.
- FIG. 6 is a cross-sectional view illustrating the semiconductor device in the second embodiment of the present invention.
- FIG. 7 is a cross-sectional view illustrating the semiconductor device in the prior art.
- FIGS. 8A and 8B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the prior art.
- FIGS. 9A and 9B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the prior art.
- FIGS. 10A and 10B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the prior art.
- the first transistor is separated by the first element-separating insulator film that is selectively left to realize element separation for the first transistor formation region. Consequently, it is possible to guarantee good characteristics of the high voltage transistor.
- the second transistor is separated by the second element-separating insulator film formed by selective oxidation of the semiconductor substrate. Consequently, it is easy to realize smaller elements and a high integration degree.
- the first element-separating insulator film is formed in the first transistor formation region, by being selectively left on the semiconductor substrate, so that good characteristics of the high voltage transistor, etc. can be guaranteed.
- the second element-separating insulator film is formed by means of selective oxidation of the semiconductor substrate in the second transistor formation region, so that it is easy to realize smaller elements and high integration degree.
- FIG. 1 is a cross-sectional view of a first example embodiment of semiconductor device according to the principles of the invention.
- high voltage PMOS transistor Tr 1 high voltage NMOS transistor Tr 2 , low voltage PMOS transistor Tr 3 and low voltage NMOS transistor Tr 4 are formed.
- n-type well 11 is formed in semiconductor substrate 1 ;
- p-type drain region 12 is formed on the surface of n-type well 11 so that it is enclosed in n-type well 11 ; and, on the surface of p-type drain region 12 , p + -type drain region 13 is formed so that it is enclosed in p-type drain region 12 .
- p + -type source region 14 (p-type drain region 12 , p + -type drain region 13 and p + -type source region 14 correspond to the first source/drain region) is formed on the surface of n-type well 11 , so that it is enclosed in n-type well 11 , and the portion between p-type drain region 12 and p + -type source region 14 becomes the channel-formation region.
- n + -type back gate 15 is formed adjacent to the side opposite the channel-formation region of p + -type source region 14 .
- gate-insulation film (first gate-insulation film) 16 with film thickness of 400 nm and made of, say, silicon oxide, is formed to cover at least the channel-formation region between the p-type drain region 12 and p + -type source region 14 , and gate electrode (first gate electrode) 17 made of, say, polysilicon, is formed as the upper layer on top of it.
- n-type drain region 21 is formed in semiconductor substrate 1 , and then n + -type drain region 22 is formed such that it is enclosed in the n-type drain region 21 .
- n + -type source region 23 is formed on the surface of semiconductor substrate 1 , and the portion between n-type drain region 21 and n + -type source region 23 becomes the channel-formation region.
- p + -type back gate 24 is formed adjacent to the side opposite the channel-formation region of n + -type source region 23 .
- Gate-insulation film 25 with a film thickness of 14 nm and made of, say, silicon oxide, is formed to cover at least the channel-formation region between the n-type drain region 21 and n + -type source region 23 . Then, gate electrode 26 made of polysilicon is formed as the upper layer on top of it.
- High voltage NMOS transistor Tr 2 is formed as explained above.
- n-type well 31 is formed in semiconductor substrate 1 , and, on the surface of n-type well 31 , a pair of P+ source/drain regions (second source/drain regions) 32 separated prescribed distance from one another are formed. The portion between the pair of p + -type source/drain regions 32 becomes the channel-formation region.
- low voltage PMOS transistor Tr 3 (second transistor) is formed.
- n + -type source/drain regions 41 separated from each other by a prescribed distance are formed on the surface of semiconductor substrate 1 .
- the portion between the pair of n + -type source/drain regions 41 (second source/drain regions) becomes the channel-formation region.
- first element-separating insulator film 2 is the element-separating insulator film formed and selectively left on semiconductor substrate 1 so that element separation is performed for the high voltage PMOS transistor and high voltage NMOS transistor.
- it has a film thickness of about 600 nm, and there is no corrosion of the drain region in the manufacturing process of LOCOS element-separating insulator film. Consequently, it is possible to realize high-performance high voltage transistors with a low on-resistance.
- This first element-separating insulator film 2 is formed by etching the insulating layer deposited on semiconductor substrate 1 in a prescribed pattern.
- second element-separating insulator film 3 is an element-separating insulator film formed by selective oxidation of the surface layer portion of semiconductor substrate 1 so that element separation is realized for the formation regions of the low voltage PMOS transistor and low voltage NMOS transistor, and it is a so-called LOCOS element-separating insulator film.
- LOCOS element-separating insulator film For example, when a film with thickness about 400 nm is used as an insulating film to separate the logic MOS transistors or other low voltage transistors, it is possible to make progress in forming smaller elements with higher integration.
- the high voltage PMOS transistor (first transistor) is separated by the first element-separating insulator film formed and selectively left to separate elements for the formation region of the high voltage PMOS transistor. Consequently, good characteristics of high voltage transistors can be established.
- the low voltage PMOS transistor and low voltage NMOS transistor (second transistors) are separated by the second element-separating insulator film (LOCOS element-separating insulator film) formed by selective oxidation of the semiconductor substrate. Consequently, it is easy to realize smaller elements and higher integration.
- the regions on semiconductor substrate 1 are allotted to high voltage PMOS transistor Tr 1 formation region R 1 , high voltage NMOS transistor Tr 2 formation region R 2 , low voltage PMOS transistor Tr 3 formation region R 3 , and low voltage NMOS transistor Tr 4 formation region R 4 . In the following, an explanation will be given regarding them.
- n-type well 11 and p-type drain region 12 are formed in high voltage PMOS transistor Tr 1 formation region R 1 ; high voltage NMOS transistor Tr 2 formation region R 2 and n-type drain region 21 are formed, and n-type well 31 is formed in low voltage PMOS transistor Tr 3 formation region R 3 .
- the transistor formation regions each have a channel-formation region.
- silicon oxide or other insulating film 2 a with a film thickness of 600 nm is formed on the entire surface of the semiconductor substrate 1 .
- a first mask layer not shown in the figure that protects the formation region of the first element-separating insulator film is formed on insulating film 2 a .
- insulating film 2 a is patterned by processing to be selectively left in the formation region of the first element-separating insulator film, thus forming first element-separating insulator film 2 .
- First element-separating insulator film 2 is used as the element-separating insulator film in high voltage PMOS transistor Tr 1 formation region R 1 and high voltage NMOS transistor Tr 2 formation region R 2 .
- second mask layer 4 is formed with opening in the formation region of the element-separating insulator film for low voltage PMOS transistor formation region R 3 and low voltage NMOS transistor formation region R 4 of semiconductor substrate 1 .
- Second mask layer 4 is formed as a pattern that opens in the channel-formation region in high voltage PMOS transistor formation region R 1 .
- the surface of semiconductor substrate 1 in the opening portion of second mask layer 4 is selectively oxidized by means of thermal oxidation processing with second mask layer 4 as a mask, to form second element-separating insulator film 4 .
- thermal oxidation treatment is performed at 900° C. for about 300 min to form an element-separating insulator film with a film thickness of about 400 nm.
- the surface of semiconductor substrate 1 is selectively oxidized in the channel-formation region to form the second element-separating insulator film, and at the same time, gate-insulation film 16 with a film thickness of about 400 nm, that is, substantially identical to that of the second element-separating insulator film, is formed.
- second mask layer 4 is selectively removed by means of etching treatment.
- gate-insulation films 25 , 33 , 42 are formed simultaneously on the surface of semiconductor substrate 1 by means of thermal oxidation on the entire surface.
- gate-insulation films 25 , 33 , 42 with a film thickness of about 14 nm are formed by means of thermal oxidation treatment at 850° C. for about 7 min.
- gate-insulation films 25 , 33 , 42 for high voltage NMOS transistor Tr 2 , low voltage PMOS transistor Tr 3 and low voltage NMOS transistor Tr 4 are formed thinner than the gate-insulation film of high voltage PMOS transistor Tr 1 .
- the same insulating film as described above is formed to cover the surface of the semiconductor substrate in the drain region instead of the channel-formation region.
- a CVD (chemical vapor deposition) method or the like is used to deposit polysilicon on the entire surface, and by means of etching with a resist film pattern, gate electrodes 17 , 26 , 34 , 43 are formed as the upper layer above gate-insulation films 16 , 25 , 33 , 42 in high voltage PMOS transistor Tr 1 formation region R 1 , high voltage NMOS transistor Tr 2 formation region R 2 , low voltage PMOS transistor Tr 3 formation region R 3 , and low voltage NMOS transistor Tr 4 formation region R 4 .
- CVD chemical vapor deposition
- a patterned resist film PR with openings formed for the p-type impurity implantation region is formed, and p-type impurity is ion-implanted to form p + -type drain region 13 , p + -type source region 14 , p + -type back gate 24 , and p + -type source/drain regions 32 .
- n-type impurity is ion-implanted to form n + -type back gate 15 , n + -type drain region 22 , n + -type source region 23 , and n + -type source/drain regions 41 .
- the manufacturing method of a semiconductor device in the aforementioned embodiment it is possible to guarantee good characteristics of the high voltage transistors, etc. because the first element-separating insulator film is formed and selectively left on the semiconductor substrate in the formation region of the high voltage PMOS transistor (first transistor).
- the second element-separating insulator film LOC element-separating insulator film
- the second element-separating insulator film is formed by selective oxidation of the semiconductor substrate in the formation region of the low voltage PMOS transistor and low voltage NMOS transistor (second transistor).
- the gate length has a limit of about 2 ⁇ m.
- the gate length has a limit of about 0.6 ⁇ m, and this is significantly effective in increasing the integration degree of the logic CMOS transistor.
- FIG. 6 is a cross-sectional view of the semiconductor device of this embodiment.
- Semiconductor substrate 1 has an SOI (semiconductor on insulator) structure in which p-type silicon semiconductor layer 1 c is laminated on a silicon oxide or other insulating film 1 on substrate 1 a .
- SOI semiconductor on insulator
- high voltage PMOS transistor Tr 1 , high voltage NMOS transistor Tr 2 , low voltage PMOS transistor Tr 3 and low voltage NMOS transistor Tr 4 are formed on p-type silicon semiconductor layer 1 c.
- high voltage PMOS transistors are separated by the first element-separating insulator film formed and selectively left for element separation of the formation region of the high voltage PMOS transistor. Consequently, good characteristics of the high voltage transistors can be maintained.
- the low voltage PMOS transistor and the low voltage NMOS transistor are separated by the second element-separating insulator film (LOCOS element-separating insulator film) formed by selective oxidation of the semiconductor substrate. Consequently, smaller elements and higher integration can be realized easily.
- high voltage PMOS transistor Tr 1 and high voltage NMOS transistor Tr 2 are not distinguished from one another, and they are formed in the same semiconductor layer 1 c .
- An insulating layer from the surface of semiconductor layer 1 c to insulating film 1 b is formed to surround each high voltage transistor, so that high voltage PMOS transistor Tr 1 and high voltage NMOS transistor Tr 2 are individually separated.
- the various high voltage transistors are formed individually in the semiconductor layers divided by the insulating layer.
- the present invention is not limited to this scheme.
- the semiconductor device has two types of transistors with different voltage ratings, that is, high voltage transistors and low voltage transistors.
- the present invention is not limited to this scheme.
- the present invention may also be adopted for semiconductor devices having two types of transistors with different film thicknesses of the gate-insulation films.
- the semiconductor device of the present invention can be adopted for semiconductor devices having two types of transistors having different film thicknesses of the gate-insulation films.
- the manufacturing method of the semiconductor device of the present invention can be adopted in manufacturing semiconductor devices having two types of transistors with different film thicknesses of the gate-insulation films.
Abstract
A semiconductor device and method of its manufacturing method are provided for realizing smaller low voltage transistors while maintaining the characteristics of high voltage transistors. A first transistor formation region is separated by selectively leaving first element-separating insulator film. A second transistor formation region is separated by selectively oxidized second element-separating insulator film. On the region separated by first element-separating insulator film, a first transistor having a first channel-formation region, first source/drain regions, and first gate-insulation film with a first film thickness and first gate electrode are formed. On the region separated by second element-separating insulator film, second transistors having a second channel-formation region, second source/drain region second gate-insulation film with thickness thinner than the first film thickness, and a second gate electrode are formed.
Description
- This relates to a semiconductor device and method of manufacture of a semiconductor device having at least two transistors with different gate insulation film thicknesses.
- MOSFET (metal-oxide-semiconductor field-effect transistors) elements are widely used as basic elements in semiconductor devices. In high voltage-rated ICs (integrated circuits), high voltage-rated MOS transistors are used that can be driven with voltages of 10-20 V, or more (hereinafter referred to as “high voltage transistors”).
-
FIG. 7 is a cross section view of a semiconductor device having high and low voltage (that is, high voltage-rated and low voltage-rated) transistors according to a conventional configuration.FIG. 7 shows high voltage PMOS and NMOS transistors Tr1, Tr2 and low voltage PMOS and NMOS transistors Tr3, Tr4, formed on a p-type semiconductor substrate 101. Insemiconductor substrate 101, the regions of transistors Tr1, Tr2, Tr3 and Tr4 are separated from each other by means of element-separatinginsulator film 102. - In the high voltage PMOS transistor formation region, n-
type well 111, p-type drain region 112, and p+-type drain region 113 are formed insemiconductor substrate 101. At a prescribed distance from the end portion of p-type drain region 112, p+-type source region 114 is formed on the surface of n-type well 111, and the portion between p-type drain region 112 and p+-type source region 114 becomes the channel-formation region. Also, n+-type back gate 115 is formed adjacent to the side opposite to the channel-formation region of p+-type source region 114. And, gate-insulation film 116 is formed to cover the channel-formation region, andgate electrode 117 is formed as the upper layer on it. This arrangement forms the high voltage PMOS transistor Tr1. - In the high voltage NMOS transistor formation region, n-
type drain region 121 and n+-type drain region 122 are formed insemiconductor substrate 101. At a prescribed distance from the end portion of n-type drain region 121, n+-type source region 123 is formed on the surface ofsemiconductor substrate 101, and the portion between n-type drain region 121 and n+-type source region 123 becomes the channel-formation region. Also, p+-type back gate 124 is formed adjacent to the side opposite the channel-formation region of n+-type source region 123. And, gate-insulation film 125 is formed to cover the channel-formation region, andgate electrode 126 is formed as the upper layer on it. This arrangement forms the high voltage NMOS transistor Tr2. - In the low voltage PMOS transistor formation region, n-
type well 131 is formed insemiconductor substrate 101. On its surface, a pair of p+-type source/drain regions 132 are formed separated from each other by a prescribed distance, and the region between them becomes the channel-formation region. Also, gate-insulation film 133 is formed to cover it, andgate electrode 134 is formed as the upper layer on it. This forms the low voltage PMOS transistor Tr3. - In the low voltage NMOS transistor formation region, a pair of n+-type source/
drain regions 141 are formed on the surface ofsemiconductor substrate 101, separated from each other by a prescribed distance, and the region between them becomes the channel-formation region. Also, gate-insulation film 142 is formed to cover it, andgate electrode 143 is formed as the upper layer on it. This forms the low voltage NMOS transistor Tr4. - As shown in the drawings, the various regions on
semiconductor substrate 1 are allotted to formation region R1 of high voltage PMOS transistor Tr1, formation region R2 of high voltage NMOS transistor Tr2, formation region R3 of low voltage PMOS transistor Tr3, and formation region R4 of low voltage NMOS transistor Tr4, and the divided regions will be explained. - First, as shown in
FIG. 8A , n-type well 111, p-type drain region 112, n-type drain region 121, and n-type well 131 are formed onsemiconductor substrate 101 by means of ion implantation, etc. Then, for example, a silicon oxide film or otherinsulating film 102 a is formed on the entire surface. Then, as shown inFIG. 8B ,insulating film 102 a is subjected to patterning processing to form element-separatinginsulator films 102. Then, as shown inFIG. 9A , thermal oxidation treatment is performed on the entire surface to form gate-insulation film 116 in high voltage PMOS transistor formation region R1. In this case,insulating film 116 a is formed on the surface ofsemiconductor substrate 101 in high voltage NMOS transistor formation region R2 and low voltage PMOS and NMOS transistor formation regions R3, R4. Then, as shown inFIG. 9B , a pattern of a resist film is formed, and openings are formed on insulatingfilm 116 a of high voltage NMOS transistor formation region R2, and low voltage PMOS and NMOS transistor formation regions R3, R4, followed by etching treatment to remove theinsulating film 116 a. Next, as shown inFIG. 10A , thermal oxidation treatment is performed on the entire surface to form gate-insulation films FIG. 10B , gate electrodes (117, 126, 134, 143) are formed on gate insulated films (116, 125, 133, 142) on high breakthrough PMOS transistor (Tr1) forming region R1, high breakthrough NMOS transistor (Tr2) forming region R2, low breakthrough PMOS transistor (Tr3) forming region R3, and low breakthrough NMOS transistor (Tr4) forming region R4, respectively. Then, in each of high voltage PMOS transistor Tr1 formation region R1, high voltage NMOS transistor Tr2 formation region R2, low voltage PMOS transistor Tr3 formation region R3, and low voltage NMOS transistor Tr4 formation region R4, gate electrode, resist film, etc. are used as masks for ion implantation to form source/drain regions connected to the channel-formation regions of the various transistor formation regions. - In addition to the aforementioned manufacturing method, there is also the manufacturing method described in Japanese Kokai Patent Application No. 2004-207498.
- In order to ensure the film thickness of the element-separating insulator film so as to guarantee the characteristics of the high voltage transistors, the step height of the element-separating insulator film becomes larger. If such an element-separating insulator film is used as is in the low voltage transistors, it becomes difficult to realize smaller transistors and a higher integration degree for logic MOS transistors, etc. that have an especially higher element density.
- The invention provides a semiconductor device comprising, in a described implementation, a semiconductor substrate; a first element-separating insulator film that is formed and selectively left on the semiconductor substrate so as to perform element separation for the first transistor-formation region; a second element-separating insulator film that is formed by selective oxidation of the surface layer of the semiconductor substrate so as to perform element separation for the second transistor-formation region; a first transistor that is formed in the region separated by the first element-separating insulator film and has a first channel-formation region and a first source/drain region formed on the semiconductor substrate, a first gate-insulation film with a first film thickness formed on the first channel-formation region, and a first gate electrode formed on the first gate-insulation film; and a second transistor that is formed in the region separated by the second element-separating insulator film and has a second channel-formation region and a second source/drain region formed on the semiconductor substrate, a second gate-insulation film with a second film thickness less than the first film thickness and formed on the second channel-formation region, and a second gate electrode formed on the second gate-insulation film.
- For the semiconductor device of the invention, the first transistor-formation region is selectively left on the semiconductor substrate so that element separation is realized, and the first element-separating insulator film is formed. On the other hand, the surface layer portion of the semiconductor substrate is selectively oxidized so that element separation is realized for the second transistor-formation region, and the second element-separating insulator film is formed. In the regions separated by the first element-separating insulator film, there are the first transistor composed of the first channel-formation region and first source/drain region formed on the semiconductor substrate, the first gate-insulation film with the first film thickness formed on the first channel-formation region, and the first gate electrode formed on the first gate-insulation film, and the second transistor composed of the second channel-formation region and second source/drain region formed on the semiconductor substrate, the second gate-insulation film with a second film thickness less than the first film thickness and formed on the second channel-formation region, and the second gate electrode formed on the second gate-insulation film.
- For example implementations of the semiconductor device of the invention, it is preferred that the first gate-insulation film and the second element-separating insulator film have substantially the same film thickness. Also, it is preferred that the first transistor be a high voltage transistor and the second transistor be a low voltage transistor. In addition, it is preferred that a back gate region be formed adjacent to the first source/drain region. It is also preferred that a transistor of the first electroconductive type and a transistor of the second electroconductive type be formed.
- For implementation of example embodiments of the semiconductor device of the invention, the following scheme is preferred: In the region separated by the first element-separating insulator film, there is also a third transistor that has a third channel-formation region and a third source/drain region formed on the semiconductor substrate, a third gate-insulation film with a film thickness less than the first film thickness and formed on the third channel-formation region, and a third gate electrode formed on the third gate-insulation film.
- In addition, it is preferred that the semiconductor substrate be a substrate having an SOI (semiconductor on insulator) structure having a semiconductor layer on an insulating film on the substrate. It is even more preferred that on the substrate of the SOI structure, the region of the semiconductor layer where the first transistor be formed is individually insulated and separated by an insulating layer formed from the surface of the semiconductor layer to reach the insulating film.
- The invention also provides a method for manufacturing semiconductor devices comprising, in a described implementation, a step in which the first transistor-formation region of the semiconductor substrate having the first channel-formation region is selectively left for element separation to form the first element-separating insulator film; a step in which the surface layer portion of the semiconductor substrate is selectively oxidized for element separation of the second transistor-formation region of the semiconductor substrate having the second channel-formation region to form the second element-separating insulator film; a step in which the first gate-insulation film with the first film thickness is formed on the surface of the semiconductor substrate in the first transistor-formation region; a step in which the second gate-insulation film with the second film thickness less than the first film thickness is formed on the surface of the semiconductor substrate in the second transistor-formation region; a step in which the first gate electrode is formed on the first gate-insulation film, and the second gate electrode is formed on the second gate-insulation film; and a step in which the first source/drain region connected to the first channel-formation region is formed, and the second source/drain region connected to the second channel-formation region is formed.
- In example implementations of the described method, the first transistor-formation region of the semiconductor substrate having the first channel-formation region is selectively left for element separation to form the first element-separating insulator film. Then, the surface layer portion of the semiconductor substrate is selectively oxidized for element separation of the second transistor-formation region of the semiconductor substrate having the second channel-formation region to form the second element-separating insulator film. Then, the first gate-insulation film with the first film thickness is formed on the surface of the semiconductor substrate in the first transistor-formation region; then the second gate-insulation film with the second film thickness less than the second film thickness is formed on the surface of the semiconductor substrate in the second transistor-formation region. Then, the first gate electrode is formed on the first gate-insulation film, and the second gate electrode is formed on the second gate-insulation film. Then, the first source/drain region connected to the first channel-formation region is formed, and the second source/drain region connected to the second channel-formation region is formed.
- In specific example implementations of the method of the invention, it is preferred that the step of forming the second element-separating insulator film and the step of forming the first gate-insulation film be carried out simultaneously. In some examples, the following implementation is preferred: The step of forming the first element-separating insulator film includes the following operation steps: a step in which an insulating film is formed on the entire surface of the semiconductor substrate, a step in which the first mask layer for protecting the formation region of the first element-separating insulator film is formed on the insulating film, and a step in which the first mask layer is used to perform patterning processing for the insulating film so as to selectively leave it in the formation region of the first element-separating insulator film to form the first element-separating insulator film.
- In some examples, the step of forming the second element-separating insulator film includes the following operation steps: a step in which the second mask layer protecting the region excluding the formation region of the second element-separating insulator film is formed on the semiconductor substrate, and a step in which the surface layer portion of the semiconductor substrate in the formation region of the second element-separating insulator film exposed from the second mask layer is selectively oxidized to form the second element-separating insulator film.
- Also, it is sometimes preferred that the step of forming the first gate-insulation film contain the following operation steps: a step in which the first gate-insulation film is formed, a step in which the second mask layer protecting the region excluding the first transistor-formation region is formed on the semiconductor substrate, and a step in which the surface layer portion of the semiconductor substrate in the first transistor-formation region exposed from the second mask layer is selectively oxidized to form the first gate-insulation film.
-
FIG. 1 is a cross-sectional view of a semiconductor device according to a first embodiment of the present invention. -
FIGS. 2A and 2B are cross-sectional views illustrating the steps of manufacturing of the semiconductor device in the first embodiment of the present invention. -
FIGS. 3A and 3B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the first embodiment of the present invention. -
FIGS. 4A and 4B are cross-sectional views illustrating the steps of manufacturing of the semiconductor device in the first embodiment of the present invention. -
FIGS. 5A and 5B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the first embodiment of the present invention. -
FIG. 6 is a cross-sectional view illustrating the semiconductor device in the second embodiment of the present invention. -
FIG. 7 is a cross-sectional view illustrating the semiconductor device in the prior art. -
FIGS. 8A and 8B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the prior art. -
FIGS. 9A and 9B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the prior art. -
FIGS. 10A and 10B are cross-sectional views illustrating the manufacturing process of the semiconductor device in the prior art. - In the semiconductor device of the invention, the first transistor is separated by the first element-separating insulator film that is selectively left to realize element separation for the first transistor formation region. Consequently, it is possible to guarantee good characteristics of the high voltage transistor. On the other hand, the second transistor is separated by the second element-separating insulator film formed by selective oxidation of the semiconductor substrate. Consequently, it is easy to realize smaller elements and a high integration degree.
- In the method for manufacturing the semiconductor device of the present invention, the first element-separating insulator film is formed in the first transistor formation region, by being selectively left on the semiconductor substrate, so that good characteristics of the high voltage transistor, etc. can be guaranteed. On the other hand, the second element-separating insulator film is formed by means of selective oxidation of the semiconductor substrate in the second transistor formation region, so that it is easy to realize smaller elements and high integration degree.
-
FIG. 1 is a cross-sectional view of a first example embodiment of semiconductor device according to the principles of the invention. - For example, on
semiconductor substrate 1, high voltage PMOS transistor Tr1, high voltage NMOS transistor Tr2, low voltage PMOS transistor Tr3 and low voltage NMOS transistor Tr4 are formed. - In the high voltage PMOS transistor formation region formed by means of first element-separating
insulator film 2 ofsemiconductor substrate 1, n-type well 11 is formed insemiconductor substrate 1; p-type drain region 12 is formed on the surface of n-type well 11 so that it is enclosed in n-type well 11; and, on the surface of p-type drain region 12, p+-type drain region 13 is formed so that it is enclosed in p-type drain region 12. - On the other hand, at a prescribed distance from the end portion of p-
type drain region 12, p+-type source region 14 (p-type drain region 12, p+-type drain region 13 and p+-type source region 14 correspond to the first source/drain region) is formed on the surface of n-type well 11, so that it is enclosed in n-type well 11, and the portion between p-type drain region 12 and p+-type source region 14 becomes the channel-formation region. - Also, n+-type back
gate 15 is formed adjacent to the side opposite the channel-formation region of p+-type source region 14. - Then, gate-insulation film (first gate-insulation film) 16 with film thickness of 400 nm and made of, say, silicon oxide, is formed to cover at least the channel-formation region between the p-
type drain region 12 and p+-type source region 14, and gate electrode (first gate electrode) 17 made of, say, polysilicon, is formed as the upper layer on top of it. - In this way, high voltage PMOS transistor Tr1 (first transistor) is formed.
- Also, in the high voltage NMOS transistor formation region with element separation realized by first element-separating
insulator film 2 ofsemiconductor substrate 1, n-type drain region 21 is formed insemiconductor substrate 1, and then n+-type drain region 22 is formed such that it is enclosed in the n-type drain region 21. - On the other hand, separated by a prescribed distance from the end portion of n-
type drain region 21, n+-type source region 23 is formed on the surface ofsemiconductor substrate 1, and the portion between n-type drain region 21 and n+-type source region 23 becomes the channel-formation region. - Also, p+-type back
gate 24 is formed adjacent to the side opposite the channel-formation region of n+-type source region 23. - Gate-
insulation film 25 with a film thickness of 14 nm and made of, say, silicon oxide, is formed to cover at least the channel-formation region between the n-type drain region 21 and n+-type source region 23. Then,gate electrode 26 made of polysilicon is formed as the upper layer on top of it. - High voltage NMOS transistor Tr2 is formed as explained above.
- Also, in the low voltage PMOS transistor formation region with element separation realized by second element-separating
insulator film 3 ofsemiconductor substrate 1, n-type well 31 is formed insemiconductor substrate 1, and, on the surface of n-type well 31, a pair of P+ source/drain regions (second source/drain regions) 32 separated prescribed distance from one another are formed. The portion between the pair of p+-type source/drain regions 32 becomes the channel-formation region. - Gate-insulation film (second gate-insulation film) 33 with film thickness of 14 nm and made of, say, silicon oxide, is formed to cover at least the channel-formation region between the pair of p+-type source/
drain regions 32, and gate electrode (second gate electrode) 34 made of, say, polysilicon is formed as the upper layer on top of it. - As explained above, low voltage PMOS transistor Tr3 (second transistor) is formed.
- In the low voltage NMOS transistor formation region with element separation realized by second element-separating
insulator film 3 ofsemiconductor substrate 1, a pair of n+-type source/drain regions 41 separated from each other by a prescribed distance are formed on the surface ofsemiconductor substrate 1. The portion between the pair of n+-type source/drain regions 41 (second source/drain regions) becomes the channel-formation region. - Gate-insulation film (second gate-insulation film) 42 with film thickness of 14 nm and made of, say, silicon oxide, is formed to cover at least the channel-formation region between the pair of n+-type source/
drain regions 41. Gate electrode (second gate electrode) 43 made of, say, polysilicon, is formed as the upper layer on top of it. - Low voltage NMOS transistor Tr4 (second transistor) is formed as explained above.
- In the aforementioned semiconductor device, first element-separating
insulator film 2 is the element-separating insulator film formed and selectively left onsemiconductor substrate 1 so that element separation is performed for the high voltage PMOS transistor and high voltage NMOS transistor. For example, it has a film thickness of about 600 nm, and there is no corrosion of the drain region in the manufacturing process of LOCOS element-separating insulator film. Consequently, it is possible to realize high-performance high voltage transistors with a low on-resistance. This first element-separatinginsulator film 2 is formed by etching the insulating layer deposited onsemiconductor substrate 1 in a prescribed pattern. - On the other hand, second element-separating
insulator film 3 is an element-separating insulator film formed by selective oxidation of the surface layer portion ofsemiconductor substrate 1 so that element separation is realized for the formation regions of the low voltage PMOS transistor and low voltage NMOS transistor, and it is a so-called LOCOS element-separating insulator film. For example, when a film with thickness about 400 nm is used as an insulating film to separate the logic MOS transistors or other low voltage transistors, it is possible to make progress in forming smaller elements with higher integration. - For the semiconductor device pertaining to the aforementioned embodiment, the high voltage PMOS transistor (first transistor) is separated by the first element-separating insulator film formed and selectively left to separate elements for the formation region of the high voltage PMOS transistor. Consequently, good characteristics of high voltage transistors can be established. On the other hand, the low voltage PMOS transistor and low voltage NMOS transistor (second transistors) are separated by the second element-separating insulator film (LOCOS element-separating insulator film) formed by selective oxidation of the semiconductor substrate. Consequently, it is easy to realize smaller elements and higher integration.
- In the following, an explanation will be given regarding the manufacturing method of the semiconductor device pertaining to the embodiment with reference to the figures.
- In the figures, the regions on
semiconductor substrate 1 are allotted to high voltage PMOS transistor Tr1 formation region R1, high voltage NMOS transistor Tr2 formation region R2, low voltage PMOS transistor Tr3 formation region R3, and low voltage NMOS transistor Tr4 formation region R4. In the following, an explanation will be given regarding them. - On
semiconductor substrate 1, by means of ion implantation, n-type well 11 and p-type drain region 12 are formed in high voltage PMOS transistor Tr1 formation region R1; high voltage NMOS transistor Tr2 formation region R2 and n-type drain region 21 are formed, and n-type well 31 is formed in low voltage PMOS transistor Tr3 formation region R3. The transistor formation regions each have a channel-formation region. - First, as shown in
FIG. 2A , silicon oxide or other insulatingfilm 2 a with a film thickness of 600 nm is formed on the entire surface of thesemiconductor substrate 1. - Then, as shown in
FIG. 2B , a first mask layer not shown in the figure that protects the formation region of the first element-separating insulator film is formed on insulatingfilm 2 a. By means of the obtained first mask layer, insulatingfilm 2 a is patterned by processing to be selectively left in the formation region of the first element-separating insulator film, thus forming first element-separatinginsulator film 2. - First element-separating
insulator film 2 is used as the element-separating insulator film in high voltage PMOS transistor Tr1 formation region R1 and high voltage NMOS transistor Tr2 formation region R2. - Then, as shown in
FIG. 3A , by forming and patterning a silicon nitride film, for example,second mask layer 4 is formed with opening in the formation region of the element-separating insulator film for low voltage PMOS transistor formation region R3 and low voltage NMOS transistor formation region R4 ofsemiconductor substrate 1. -
Second mask layer 4 is formed as a pattern that opens in the channel-formation region in high voltage PMOS transistor formation region R1. - Then, as shown in
FIG. 3B , in low voltage PMOS transistor formation region R3 and low voltage NMOS transistor formation region R4 ofsemiconductor substrate 1, the surface ofsemiconductor substrate 1 in the opening portion ofsecond mask layer 4 is selectively oxidized by means of thermal oxidation processing withsecond mask layer 4 as a mask, to form second element-separatinginsulator film 4. For example, thermal oxidation treatment is performed at 900° C. for about 300 min to form an element-separating insulator film with a film thickness of about 400 nm. - On the other hand, in high voltage PMOS transistor formation region R1, the surface of
semiconductor substrate 1 is selectively oxidized in the channel-formation region to form the second element-separating insulator film, and at the same time, gate-insulation film 16 with a film thickness of about 400 nm, that is, substantially identical to that of the second element-separating insulator film, is formed. - Then, as shown in
FIG. 4A ,second mask layer 4 is selectively removed by means of etching treatment. - Then, as shown in
FIG. 4B , in the channel-formation region of each of high voltage NMOS transistor Tr2 formation region R2, low voltage PMOS transistor Tr3 formation region R3, and low voltage NMOS transistor Tr4 formation region R4, and gate-insulation films semiconductor substrate 1 by means of thermal oxidation on the entire surface. For example, gate-insulation films - In this way, gate-
insulation films - On the other hand, in high voltage PMOS transistor Tr1 formation region R1, the same insulating film as described above is formed to cover the surface of the semiconductor substrate in the drain region instead of the channel-formation region.
- Then, as shown in
FIG. 5A , a CVD (chemical vapor deposition) method or the like is used to deposit polysilicon on the entire surface, and by means of etching with a resist film pattern,gate electrodes insulation films - Then, on each of high voltage PMOS transistor Tr1 formation region R1, high voltage NMOS transistor Tr2 formation region R2, low voltage PMOS transistor Tr3 formation region R3, and low voltage NMOS transistor Tr4 formation region R4, ion implantation is performed with the gate electrode, resist film, etc. used as mask to form the source/drain regions connected to the channel-formation regions of the various transistor formation regions.
- For example, as shown in
FIG. 5B , a patterned resist film PR with openings formed for the p-type impurity implantation region is formed, and p-type impurity is ion-implanted to form p+-type drain region 13, p+-type source region 14, p+-type backgate 24, and p+-type source/drain regions 32. - Then, a patterned resist film with openings formed for the n-type impurity implantation region is formed, and n-type impurity is ion-implanted to form n+-type back
gate 15, n+-type drain region 22, n+-type source region 23, and n+-type source/drain regions 41. - In the aforementioned operation, a semiconductor device with the structure shown in
FIG. 1 is obtained. - In the manufacturing method of a semiconductor device in the aforementioned embodiment, it is possible to guarantee good characteristics of the high voltage transistors, etc. because the first element-separating insulator film is formed and selectively left on the semiconductor substrate in the formation region of the high voltage PMOS transistor (first transistor). On the other hand, it is easy to realize smaller elements and a high integration degree because the second element-separating insulator film (LOCOS element-separating insulator film) is formed by selective oxidation of the semiconductor substrate in the formation region of the low voltage PMOS transistor and low voltage NMOS transistor (second transistor).
- Also, by simultaneous formation of the gate-
insulation film 16 of high voltage PMOS transistor and second element-separatinginsulator film 3, it is possible to shorten the thermal process, and to shorten the manufacturing process. - In addition, by shortening the thermal process, it is possible to maintain good characteristics of the element for which excessive thermal treatment is undesired.
- For example, in the prior art, for the low voltage PMOS transistor and low voltage NMOS transistor, the gate length has a limit of about 2 μm. However, by means of this embodiment, with minimal change in the manufacturing process, it is possible to form a narrower structure, with a gate length of about 0.6 μm, and this is significantly effective in increasing the integration degree of the logic CMOS transistor.
-
FIG. 6 is a cross-sectional view of the semiconductor device of this embodiment. - The design is the same as that of the first embodiment.
Semiconductor substrate 1 has an SOI (semiconductor on insulator) structure in which p-typesilicon semiconductor layer 1 c is laminated on a silicon oxide or other insulatingfilm 1 onsubstrate 1 a. Just as in the first embodiment, high voltage PMOS transistor Tr1, high voltage NMOS transistor Tr2, low voltage PMOS transistor Tr3 and low voltage NMOS transistor Tr4 are formed on p-typesilicon semiconductor layer 1 c. - The remaining features of the constitution are the same as those in the first embodiment.
- In the semiconductor device of this embodiment, just as in the first embodiment, high voltage PMOS transistors (first transistors) are separated by the first element-separating insulator film formed and selectively left for element separation of the formation region of the high voltage PMOS transistor. Consequently, good characteristics of the high voltage transistors can be maintained. On the other hand, the low voltage PMOS transistor and the low voltage NMOS transistor (second transistors) are separated by the second element-separating insulator film (LOCOS element-separating insulator film) formed by selective oxidation of the semiconductor substrate. Consequently, smaller elements and higher integration can be realized easily.
- In this embodiment, high voltage PMOS transistor Tr1 and high voltage NMOS transistor Tr2 are not distinguished from one another, and they are formed in the
same semiconductor layer 1 c. An insulating layer from the surface ofsemiconductor layer 1 c to insulatingfilm 1 b is formed to surround each high voltage transistor, so that high voltage PMOS transistor Tr1 and high voltage NMOS transistor Tr2 are individually separated. In this case, the various high voltage transistors are formed individually in the semiconductor layers divided by the insulating layer. - When excessive heat treatment is performed on the low voltage PMOS transistor and low voltage NMOS transistor, contamination is accumulated in the SOI substrate of this embodiment, and the characteristics degrade, and this is undesirable. Now, in this embodiment, because the thermal process can be shortened, excessive heat treatment can be avoided, and the aforementioned problem can be avoided. This is especially effective when the high voltage transistors are individually separated as they are formed.
- The present invention is not limited to this scheme. In the above explanation, the semiconductor device has two types of transistors with different voltage ratings, that is, high voltage transistors and low voltage transistors. However, the present invention is not limited to this scheme. The present invention may also be adopted for semiconductor devices having two types of transistors with different film thicknesses of the gate-insulation films.
- Also, as long as the essential teaching of the present invention is observed, various changes may be made.
- The semiconductor device of the present invention can be adopted for semiconductor devices having two types of transistors having different film thicknesses of the gate-insulation films.
- The manufacturing method of the semiconductor device of the present invention can be adopted in manufacturing semiconductor devices having two types of transistors with different film thicknesses of the gate-insulation films.
Claims (13)
1. A semiconductor device comprising:
a semiconductor substrate;
a first element-separating insulator film that is formed and selectively left on the semiconductor substrate so as to perform element separation for the first transistor-formation region;
a second element-separating insulator film that is formed by selective oxidation of the surface layer of the semiconductor substrate so as to perform element separation for the second transistor-formation region;
a first transistor that is formed in the region separated by the first element-separating insulator film and has a first channel-formation region and a first source/drain region formed on the semiconductor substrate, a first gate-insulation film with the first film thickness formed on the first channel-formation region, and a first gate electrode formed on the first gate-insulation film; and
and a second transistor that is formed in the region separated by the second element-separating insulator film and has a second channel-formation region and a second source/drain region formed on the semiconductor substrate, a second gate-insulation film with a second film thickness less than the first film thickness and formed on the second channel-formation region, and a second gate electrode formed on the second gate-insulation film.
2. The device of claim 1 , wherein the first gate-insulation film and the second element-separating insulator film have substantially the same film thickness.
3. The device of claim 1 , wherein the first transistor is a high voltage transistor and the second transistor is a low voltage transistor.
4. The device of claim 1 , wherein a back gate region is formed adjacent to the first source/drain region.
5. The device of claim 1 , wherein, as the second transistor, a transistor of the first electroconductive type and a transistor of the second electroconductive type are formed.
6. The device of claim 1 , wherein, in the region separated by the first element-separating insulator film, there is also a third transistor that has a second channel-formation region and a third source/drain region formed on the semiconductor substrate, a second gate-insulation film with film thickness less than the first film thickness and formed on the third channel-formation region, and a third gate electrode formed on the third gate-insulation film.
7. The device of claim 1 , wherein the semiconductor substrate is a substrate having an SOI (semiconductor on insulator) structure having a semiconductor layer on an insulating film on the substrate.
8. The device of claim 7 , wherein, on the substrate of the SOI structure, the region of the semiconductor layer where the first transistor is formed is individually insulated and separated by an insulating layer formed from the surface of the semiconductor layer to reach the insulating film.
9. A method for manufacturing a semiconductor device characterized by the following operation steps:
a step in which the first transistor-formation region of the semiconductor substrate having the first channel-formation region is selectively left for element separation to form the first element-separating insulator film;
a step in which the surface layer portion of the semiconductor substrate is selectively oxidized for element separation of the second transistor-formation region of the semiconductor substrate having the second channel-formation region to form the second element-separating insulator film;
a step in which the first gate-insulation film with the first film thickness is formed on the surface of the semiconductor substrate in the first transistor-formation region;
a step in which the second gate-insulation film with the second film thickness less than the second film thickness is formed on the surface of the semiconductor substrate in the second transistor-formation region;
a step in which the first gate electrode is formed on the first gate-insulation film, and the second gate electrode is formed on the second gate-insulation film; and
a step in which the first source/drain region connected to the first channel-formation region is formed, and the second source/drain region connected to the second channel-formation region is formed.
10. The method of claim 9 , wherein the step of forming the second element-separating insulator film and the step of forming the first gate-insulation film are carried out simultaneously.
11. The method of claim 9 , wherein t the step of forming the first element-separating insulator film includes the following operation steps:
a step in which an insulating film is formed on the entire surface of the semiconductor substrate,
a step in which the first mask layer for protecting the formation region of the first element-separating insulator film is formed on the insulating film,
and a step in which the first mask layer is used to perform patterning processing for the insulating film so as to selectively leave it in the formation region of the first element-separating insulator film to form the first element-separating insulator film.
12. The method of claim 9 , wherein the step of forming the second element-separating insulator film includes the following operation steps:
a step in which the second mask layer protecting the region excluding the formation region of the second element-separating insulator film is formed on the semiconductor substrate, and
a step in which the surface layer portion of the semiconductor substrate in the formation region of the second element-separating insulator film exposed from the second mask layer is selectively oxidized to form the second element-separating insulator film.
13. The method of claim 9 , wherein the step of forming the first gate-insulation film includes the following operation steps:
a step in which the first gate-insulation film is formed,
a step in which the second mask layer protecting the region excluding the first transistor formation region is formed on the semiconductor substrate,
and a step in which the surface layer portion of the semiconductor substrate in the first transistor formation region exposed from the second mask layer is selectively oxidized to form the first gate-insulation film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/755,320 US7883955B2 (en) | 2004-11-05 | 2010-04-06 | Gate dielectric/isolation structure formation in high/low voltage regions of semiconductor device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004322774A JP4471815B2 (en) | 2004-11-05 | 2004-11-05 | Semiconductor device and manufacturing method thereof |
JP2004-322774 | 2004-11-05 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/755,320 Division US7883955B2 (en) | 2004-11-05 | 2010-04-06 | Gate dielectric/isolation structure formation in high/low voltage regions of semiconductor device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060163641A1 true US20060163641A1 (en) | 2006-07-27 |
Family
ID=36337048
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/266,988 Abandoned US20060163641A1 (en) | 2004-11-05 | 2005-11-04 | Insulation film semiconductor device and method |
US12/755,320 Active US7883955B2 (en) | 2004-11-05 | 2010-04-06 | Gate dielectric/isolation structure formation in high/low voltage regions of semiconductor device |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/755,320 Active US7883955B2 (en) | 2004-11-05 | 2010-04-06 | Gate dielectric/isolation structure formation in high/low voltage regions of semiconductor device |
Country Status (4)
Country | Link |
---|---|
US (2) | US20060163641A1 (en) |
JP (1) | JP4471815B2 (en) |
CN (1) | CN100483737C (en) |
WO (1) | WO2006052791A2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090200397A1 (en) * | 2005-05-23 | 2009-08-13 | Vladimir Lvovich Sheiman | Apparatus for atomisation and liquid filtration |
US7814901B2 (en) | 2005-03-09 | 2010-10-19 | Ric Investments, Llc | Nebulizing drug delivery device with increased flow rate |
US8001962B2 (en) | 2002-08-23 | 2011-08-23 | Sheiman Ultrasonic Research Foundation Pty Ltd. | Nebulizing and drug delivery device |
CN104282627A (en) * | 2013-07-11 | 2015-01-14 | 精工爱普生株式会社 | Semiconductor device and method for manufacturing the same |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009130192A (en) * | 2007-11-26 | 2009-06-11 | Fujitsu Microelectronics Ltd | Method for manufacturing semiconductor device |
EP2306508B1 (en) | 2009-09-29 | 2012-11-28 | STMicroelectronics Srl | Integrated device with raised LOCOS insulation regions and process for manufacturing such device |
US8338888B2 (en) | 2009-09-29 | 2012-12-25 | STMicroelectronicis S.r.l. | Process for manufacturing an integrated device with “damascene” field insulation, and integrated device made by such process |
US8507988B2 (en) * | 2009-10-02 | 2013-08-13 | Taiwan Semiconductor Manufacturing Company, Ltd. | High voltage devices, systems, and methods for forming the high voltage devices |
CN105990421A (en) * | 2015-01-29 | 2016-10-05 | 无锡华润上华半导体有限公司 | Semiconductor device and preparation method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4442448A (en) * | 1979-10-26 | 1984-04-10 | Seiko Instruments & Electronics Ltd. | Logic integrated circuit device |
US5191401A (en) * | 1989-03-10 | 1993-03-02 | Kabushiki Kaisha Toshiba | MOS transistor with high breakdown voltage |
US6313508B1 (en) * | 1997-10-28 | 2001-11-06 | Nec Corporation | Semiconductor device of high-voltage CMOS structure and method of fabricating same |
US20020130314A1 (en) * | 2001-03-17 | 2002-09-19 | Samsung Electronics Co., Ltd. | Non-volatile memory device having a metal-oxide-nitride-oxide-semiconductor gate structure and fabrication method thereof |
US20030080354A1 (en) * | 2001-10-18 | 2003-05-01 | Seiko Epson Corporation | Method for manufacturing semiconductor device, and semiconductor device |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2705106B2 (en) * | 1988-05-25 | 1998-01-26 | セイコーエプソン株式会社 | Method for manufacturing semiconductor device |
US5332913A (en) * | 1991-12-17 | 1994-07-26 | Intel Corporation | Buried interconnect structure for semiconductor devices |
JP4190940B2 (en) * | 2003-05-13 | 2008-12-03 | エルピーダメモリ株式会社 | Manufacturing method of semiconductor device |
JP4198006B2 (en) * | 2003-07-25 | 2008-12-17 | 株式会社リコー | Manufacturing method of semiconductor device |
JP2005116975A (en) * | 2003-10-10 | 2005-04-28 | Seiko Epson Corp | Method of manufacturing semiconductor device |
KR100598033B1 (en) * | 2004-02-03 | 2006-07-07 | 삼성전자주식회사 | Fabrication method of dual gate oxide |
US7402480B2 (en) * | 2004-07-01 | 2008-07-22 | Linear Technology Corporation | Method of fabricating a semiconductor device with multiple gate oxide thicknesses |
US7364969B2 (en) * | 2005-07-01 | 2008-04-29 | Freescale Semiconductor, Inc. | Semiconductor fabrication process for integrating formation of embedded nonvolatile storage device with formation of multiple transistor device types |
JP4928825B2 (en) * | 2006-05-10 | 2012-05-09 | ルネサスエレクトロニクス株式会社 | Manufacturing method of semiconductor device |
-
2004
- 2004-11-05 JP JP2004322774A patent/JP4471815B2/en not_active Expired - Fee Related
-
2005
- 2005-11-04 CN CNB2005800424046A patent/CN100483737C/en active Active
- 2005-11-04 US US11/266,988 patent/US20060163641A1/en not_active Abandoned
- 2005-11-04 WO PCT/US2005/040108 patent/WO2006052791A2/en active Application Filing
-
2010
- 2010-04-06 US US12/755,320 patent/US7883955B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4442448A (en) * | 1979-10-26 | 1984-04-10 | Seiko Instruments & Electronics Ltd. | Logic integrated circuit device |
US5191401A (en) * | 1989-03-10 | 1993-03-02 | Kabushiki Kaisha Toshiba | MOS transistor with high breakdown voltage |
US6313508B1 (en) * | 1997-10-28 | 2001-11-06 | Nec Corporation | Semiconductor device of high-voltage CMOS structure and method of fabricating same |
US20020130314A1 (en) * | 2001-03-17 | 2002-09-19 | Samsung Electronics Co., Ltd. | Non-volatile memory device having a metal-oxide-nitride-oxide-semiconductor gate structure and fabrication method thereof |
US20030080354A1 (en) * | 2001-10-18 | 2003-05-01 | Seiko Epson Corporation | Method for manufacturing semiconductor device, and semiconductor device |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8001962B2 (en) | 2002-08-23 | 2011-08-23 | Sheiman Ultrasonic Research Foundation Pty Ltd. | Nebulizing and drug delivery device |
US7814901B2 (en) | 2005-03-09 | 2010-10-19 | Ric Investments, Llc | Nebulizing drug delivery device with increased flow rate |
US20090200397A1 (en) * | 2005-05-23 | 2009-08-13 | Vladimir Lvovich Sheiman | Apparatus for atomisation and liquid filtration |
US9339836B2 (en) | 2005-05-23 | 2016-05-17 | Biosonic Australia Pty Ltd | Ultrasonic atomization apparatus |
CN104282627A (en) * | 2013-07-11 | 2015-01-14 | 精工爱普生株式会社 | Semiconductor device and method for manufacturing the same |
US9224608B2 (en) | 2013-07-11 | 2015-12-29 | Seiko Epson Corporation | Semiconductor device and method for manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
WO2006052791A3 (en) | 2006-12-07 |
CN101076894A (en) | 2007-11-21 |
WO2006052791A2 (en) | 2006-05-18 |
JP4471815B2 (en) | 2010-06-02 |
US7883955B2 (en) | 2011-02-08 |
CN100483737C (en) | 2009-04-29 |
JP2006135102A (en) | 2006-05-25 |
US20100197091A1 (en) | 2010-08-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7883955B2 (en) | Gate dielectric/isolation structure formation in high/low voltage regions of semiconductor device | |
US7790554B2 (en) | Method of manufacturing semiconductor integrated circuit device with high and low breakdown-voltage MISFETs | |
US6043157A (en) | Semiconductor device having dual gate electrode material and process of fabrication thereof | |
JP5163311B2 (en) | Semiconductor device and manufacturing method thereof | |
JP2009044051A (en) | Semiconductor device and its manufacturing method | |
US7410874B2 (en) | Method of integrating triple gate oxide thickness | |
JP2635809B2 (en) | Semiconductor device and manufacturing method thereof | |
US7759744B2 (en) | Semiconductor device having high dielectric constant layers of different thicknesses | |
US20080054366A1 (en) | CMOS semiconductor device having tensile and compressive stress films | |
US6677194B2 (en) | Method of manufacturing a semiconductor integrated circuit device | |
JP5627165B2 (en) | Semiconductor device and manufacturing method of semiconductor device | |
US6890824B2 (en) | Semiconductor device and manufacturing method thereof | |
US20050205940A1 (en) | Semiconductor device and method for manufacturing the same | |
US8502325B2 (en) | Metal high-K transistor having silicon sidewalls for reduced parasitic capacitance | |
JPS6329967A (en) | Manufacture of semiconductor device | |
US7468540B2 (en) | Semiconductor device and method for manufacturing the same | |
KR100629267B1 (en) | Integrated circuit device having a dual-gate structure and method of fabricating the same | |
JP3125929B2 (en) | Method for manufacturing semiconductor device | |
JP3439415B2 (en) | Method for manufacturing semiconductor device | |
JP2005353655A (en) | Manufacturing method of semiconductor device | |
JP4011014B2 (en) | Semiconductor device and manufacturing method thereof | |
JP2000183177A (en) | Manufacture semiconductor device | |
US6753573B2 (en) | Semiconductor device having complementary MOS transistor | |
US20040159949A1 (en) | Semiconductor device and method of manufacturing the same | |
JPH09246541A (en) | Manufacture of semiconductor device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TEXAS INSTRUMENTS INCORPORATED, TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKUMURA, YOICHI;TEXAS INSTRUMENTS JAPAN, LTD.;REEL/FRAME:017428/0378 Effective date: 20060406 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |