Patent ID: 8779503

Claim:
A nonvolatile semiconductor memory comprising a first memory cell, the first memory cell comprising: a semiconductor layer; a first insulating layer on the semiconductor layer; a charge storage layer on the first insulating layer; a second insulating layer on the charge storage layer; and a control gate electrode on the second insulating layer, wherein the second insulating layer comprises a stacked structure provided in order of a first lanthanum aluminate layer, a lanthanum aluminum silicate layer and a second lanthanum aluminate layer from the charge storage layer side to the control gate electrode side, dielectric constants of the first and second lanthanum aluminate layers are higher than a dielectric constant of the lanthanum aluminum silicate layer, and energy band gaps between the charge storage layer and each of the first and second lanthanum aluminate layers are smaller than an energy band gap between the charge storage layer and the lanthanum aluminum silicate layer.