A manufacturing method for a pipe-shaped memory cell device includes forming a bottom electrode having a top surface; forming a fill layer over the electrode, with a via having sides, extending from a top surface of the fill layer to the top surface of the bottom electrode; forming a conformal layer...http://www.google.co.uk/patents/US20070111429?utm_source=gb-gplus-sharePatent US20070111429 - Method of manufacturing a pipe shaped phase change memory
