Patent ID: 6607957
Filing Date: 2003-08-19
Classification: H01L

Abstract:
A method for fabricating a nitride read only memory (NROM), comprising:forming a doped polysilicon layer over a substrate, wherein the doped polysilicon layer contains dopants; forming a patterned mask layer on the doped polysilicon layer; defining the doped polysilicon layer by using the patterned mask layer as a mask to form a plurality of doped polysilicon lines and expose a portion of the substrate; performing a thermal process to form an oxide layer on the exposed substrate and sidewalls of the doped polysilicon lines and drive the dopants diffusing into the substrate to form a source/drain region, thereby obtaining a plurality of bit lines including the doped polysilicon lines and the source/drain region; removing the patterned mask layer to expose a top surface of the bit lines; performing a self-aligned silicide process to form a self-aligned silicide layer on the top surface of the bit lines; removing the oxide layer; forming a silicon nitride stacked layer over the substrate; and forming a plurality of word lines over the substrate.