Patent ID: 6063656
Filing Date: 2000-05-16
Classification: H01L

Abstract:
A method of producing a memory cell, comprising:providing an intermediate structure comprising a substrate having at least one thick field oxide area and at least one active area, including at least one implanted drain region and at least one implanted source region, said intermediate structure further including at least one transistor gate member spanned between said at least one drain region and said at least one source region on said at least one substrate active area, and a barrier layer substantially covering said at least one field oxide area, said at least one active area, and said at least one transistor gate member;patterning a first resist on said barrier layer;removing said barrier layer in said pattern of said first resist to a predetermined depth to form recesses with corners formed at a step between said recesses and non-removed portions of said barrier layer;removing said first resist;depositing a shield layer over said barrier layer;patterning a second resist on said shield layer;removing said shield layer in said pattern of said second resist such that a portion of said shield layer under said second resist and a portion of said shield layer in said barrier layer recess comers remain after said shield layer removal;removing said barrier layer to expose a portion of said at least one transistor gate, member, a portion of said at least one active area, and a portion of said at least one field oxide area;removing said second resist;depositing a storage poly layer;depositing a support material over said storage poly layer prior to the removing said remaining shield layer portions;removing said remaining shield layer portions;removing said support material after removing said shield layer portions;depositing a dielectric layer over said storage poly layer; anddepositing a cell poly layer over said dielectric layer.