Patent ID: 7514311

Claim:
A method of fabricating a silicon-oxide-nitride-oxide-silicon (SONGS) memory, comprising: providing a substrate; forming a bottom silicon oxide layer over the substrate; forming a patterned mask layer over the bottom silicon oxide layer, wherein the patterned mask layer has a trench; forming a charge-trapping layer over the substrate to cover the surface of the trench; removing a portion of the charge-trapping layer to form a pair of charge storage spacers on the sidewalls of the trench; removing the patterned mask layer; forming a top silicon oxide layer over the substrate to cover the pair of charge storage spacers and the bottom silicon oxide layer; forming a gate over the top silicon oxide layer above the pair of charge storage spacers; forming a pair of dielectric spacers on the sidewalls of the gate; removing portions of the top silicon oxide layer and the underlying bottom silicon oxide layer by using the dielectric spacers and the gate as hard masks, so as a surface of the substrate is exposed; and forming source/drain regions in the substrate on each side of the gate.