Patent ID: 7453118

Claim:
A non-volatile semiconductor memory device comprising: a first conductivity type semiconductor substrate (SUB); a first conductivity type inversion layer-forming region (CH 1 ) defined in a surface region of said semiconductor substrate (SUB), a channel being formed by an inversion layer therein; second conductivity type accumulation layer-forming regions (ACLa, ACLb) formed at least at one side of said inversion layer-forming region (CH 1 ) in the surface region of said semiconductor substrate (SUB), channels being formed by accumulation layers therein; a channel-forming region (CH) including said inversion layer-forming region (CH 1 ) and said accumulation layer-forming regions (ACLa, ACLb); a first second conductivity type region (S/D 1 ) formed at one side of said channel forming region (CH) in the surface region of said semiconductor substrate (SUB); a second second conductivity type region (S/D 2 ) formed at other side of said channel forming region (CH) in the surface region of said semiconductor substrate (SUB); an insulating film (GD 0 ) formed on said inversion layer-forming region (CH 1 ) between said accumulation layer-forming regions (ACLa, ACLb); a first conductive layer (CL) formed on said insulating film (GD 0 ); a charge accumulation film (GD) having a charge accumulation faculty formed directly on an upper surface of said first conductive layer (CL), a side surface of a stacked portion of said insulating film (GD 0 ) and said first conductive layer (CL), an exposure surface of said inversion layer-forming region (CH 1 ), an upper surface of said accumulation layer-forming regions (ACLa, ACLb), and an upper surface of said first and second second conductivity type regions (S/D 1 , S/D 2 ); and a second conductive layer (WL) formed directly on said charge accumulation film (GD), said second conductive layer (WL) being a part of a word line, and said first and second second conductivity type regions (S/D 1 , S/D 2 ) being parts of bit lines (Bla, BLb), respectively, wherein said first conductivity type is p-type and second conductivity type is n-type.