Patent ID: 7880220

Claim:
A non-volatile memory device, comprising: a buffer oxide film; a polysilicon layer on the buffer oxide film; a first insulator including a first silicon oxy-nitride (SiO x N y ) layer disposed directly on the polysilicon layer and a first silicon dioxide (SiO 2 ) layer on the first SiO x N y layer in which a concentration of nitrogen in the first SiO x N y layer is highest in a portion of the first SiO x N y layer closest to the polysilicon layer and lowest in a portion of the first SiO x N y layer farthest away from the polysilicon layer; a nitride film on the first insulator; a second insulator including a second silicon oxy-nitride (SiO x N y ) layer on the nitride film and a second silicon dioxide (SiO 2 ) layer on the second SiO x N y layer; a gate electrode on the second insulator; and a source/drain in the polysilicon layer.