Patent ID: 6281078
Filing Date: 2001-08-28
Classification: H01L

Abstract:
A method for fabricating a semiconductor device comprising:providing a first layer of polysilicon on the surface of a semiconductor substrate;protecting selected portions of said first layer of polysilicon and exposing portions of said first layer of polysilicon by providing a masking material over said selected portions;removing said exposed portions of said first layer of polysilicon;providing a second layer of polysilicon over said surface of said semiconductor substrate;anisotropically removing said second layer of polysilicon, so as to form spacers of said second layer of polysilicon adjacent said protected selected portions of said first layer of polysilicon;removing said masking material;providing a triple layer of oxide-nitride-oxide (ONO) over said first layer of polysilicon and said spacer;forming a third layer of polysilicon over said triple layer of oxide-nitride-oxide;removing portions of said third layer of polysilicon, said triple layer, said first layer of polysilicon and said spacer between intended locations of memory core cells successively; andremoving ONO material remaining between intended locations of memory core cells.