Patent ID: 7719047

Claim:
A non-volatile memory device comprising: a buffer oxide film on a substrate; a polysilicon layer on the buffer oxide film; a first insulator including a sequential stack of a silicon oxy-nitride (SiO x N y ) layer and a silicon dioxide (SiO 2 ) layer on the polysilicon layer; a silicon-rich silicon nitride film on the first insulator; a second insulator on the silicon-rich silicon nitride film; a gate electrode on the second insulator; and a source and drain in the polysilicon layer, wherein the silicon oxy-nitride (SiO x N y ) layer is formed directly on the polysilicon layer and the silicon dioxide (SiO 2 ) layer is formed directly on the silicon oxy-nitride (SiO x N y ) layer and contacts the silicon-rich silicon nitride film.