Patent ID: 7972896
Filing Date: 2011-07-05
Classification: H01L

Abstract:
1. A method comprising: forming a plurality of lower conductive material plates over a semiconductor substrate; forming a first insulating film over the plurality of lower conductive material plates; forming a plurality of first contacts in the first insulating film, wherein the plurality of first contacts are coupled to the plurality of lower conductive material plates in one-to-one correspondence; forming a plurality of gate plates arranged in a parallel matrix over the first insulating film, wherein the plurality of gate plates are coupled to the plurality of first contacts in one-to-one correspondence, and wherein the plurality of gate plates comprise phase change material; forming a second insulating film over the plurality of gate plates; forming a plurality of second contacts in the second insulating film, wherein the plurality of second contacts are coupled to the gate plates in one-to-one correspondence; and forming an upper conductive material plate over the second insulating film, wherein the upper conductive material plate is coupled to the plurality of second contacts, wherein contact areas between the plurality of the gate plates and the plurality of the second contacts are different from each other in size.