Patent ID: 7550313
Filing Date: 2009-06-23
Classification: G11C,H01L,Y10S

Abstract:
1. A method for forming a plurality of Phase Change Memory (PCM) cells, said PCM cells in electrical contact with a set of electrical conductors having exposed top surfaces on a substrate with said substrate having an upper surface and with said PCM cells being located in inboard regions above said electrical conductors and said substrate aside from outboard regions comprising: forming a bilayer on said upper surface of said substrate, said bilayer comprising a PCM material layer in electrical contact with said top surfaces of said via conductors extending across said inboard regions and said outboard regions and an encapsulating layer composed of an electrically conductive material on top of said PCM material layer extending across said inboard regions and outboard regions; implanting ions into said encapsulating layer and said PCM material layer to form high electrical resistance regions of said PCM material layer and high electrical resistance regions of said encapsulating layer, with said PCM cells being formed as separate cells in said inboard regions from portions of said encapsulating layer and portions of said PCM material layer in contact with said top surface of said electrical conductors and forming resistive material from portions of said encapsulating layer and portions of said PCM material layer in said outboard regions.