Patent ID: 8017989

Claim:
A nonvolatile semiconductor memory device comprising: a semiconductor substrate having a semiconductor layer and an insulating material provided on a surface thereof, a surface of the insulating material being covered with the semiconductor layer; a plurality of memory cells provided on the semiconductor layer, the memory cells comprising: a first dielectric film provided by covering the surface of the semiconductor layer; a plurality of charge storage layers, each of which is provided above the insulating material and on the first dielectric film; a plurality of second dielectric films, each of which is provided on the each charge storage layer; a plurality of conductive layers, each of which is provided on the each second dielectric film; and an impurity diffusion layer formed partially or overall at least above the insulating material and inside the semiconductor layer and at least a portion of a bottom end thereof being provided by an upper surface of the insulating material; a semiconductor compound layer containing at least one of nitrogen and carbon and provided at an interface at least between the upper surface of the insulating material and the semiconductor layer; and a select-gate transistor provided on the semiconductor substrate, the select-gate transistor comprising: a third dielectric film provided by covering a surface of the semiconductor substrate; and a second conductive layer provided on the third dielectric film, wherein the insulating material is provided under the memory cells and is not provided under the select-gate transistor.