Patent ID: 6352895
Filing Date: 2002-03-05
Classification: H01L

Abstract:
A method of forming a non-volatile memory cell having an oxide-nitride-oxide (ONO) capacitor merged with a polysilicon strap comprising the steps of:(a) forming a film stack on a surface of a substrate, said film stack comprising at least a floating gate oxide layer, a floating gate polysilicon layer, an oxide layer and a nitride layer; (b.) forming an opening in said film stack so as to expose a portion of said floating gate polysilicon layer; (c) forming oxide spacers in said opening; (d) forming an oxide-nitride-oxide capacitor in said opening; (e) forming polysilicon spacers on said oxide-nitride-oxide capacitor; (f) providing a contact hole in said opening so as to expose a portion of said substrate; (g) forming an oxide liner in said contact hole and on said nitride layer of said film stack; (h) forming a source region in said substrate; (i) forming oxide spacers from said oxide liner; (j) filling said opening and contact hole with doped polysilicon; and (k) planarizing down to said nitride layer of said film stack.