Patent ID: 6436764
Filing Date: 2002-08-20
Classification: H01L

Abstract:
A method for forming a flash memory device on a semiconductor substrate, comprising:defining at least two first conductive structures over said substrate; depositing a first insulating layer over said substrate to insulate said at least two first conductive structures, said first insulating layer comprises first insulating material; depositing a first conductive layer over said first insulating layer; patterning and etching said first conductive layer to form a second conductive structure overlying a portion of each of two adjacent said first conductive structures; forming a second insulating layer on said second conductive structure, wherein said second insulating layer comprises said first insulating material; forming two first junction regions within said substrate using said two adjacent first conductive structures and said second conductive structure as masking; forming dielectric spacers on said second insulating layer over side walls of said second conductive structure, wherein said dielectric spacers comprise second insulating material; patterning and etching said second conductive structure in a self-aligned manner to form two separate conductive structures; and forming a second junction region between said two first junction regions within said substrate using said two separate conductive structures and said two adjacent first conductive structures as masking.