Patent ID: 7445996
Filing Date: 2008-11-04
Classification: H01L

Abstract:
1. A method of forming a memory device, said method comprising: providing a substrate having a memory cell array area and a peripheral circuitry area, wherein said memory cell array area comprises at least one polysilicon plug; providing an insulating layer over said substrate; defining at least one periphery contact opening in material layers over said substrate at said periphery circuitry area of said substrate, wherein said material layers at said periphery circuitry area are at least said insulating layer, and said at least one periphery contact opening exposes said substrate; providing a low resistance metal film layer over said insulating layer and into said at least one periphery contact opening to contact said substrate and form metal silicide within said at least one periphery contact opening; defining at least one memory cell array contact opening in said material layers over said substrate at said memory cell array area of said substrate, wherein said material layers at said memory cell array area are at least said insulating layer and said low resistance metal film layer and, said at least one memory cell array contact opening exposes said at least one polysilicon plug; and providing a metal mode film layer over said substrate and into said at least one memory cell array contact opening to physically contact said at least one polysilicon plug.