Patent ID: 8742487
Filing Date: 2014-06-03
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device comprising: a semiconductor substrate; a first insulation layer formed on the semiconductor substrate; a charge storage layer formed on the first insulation layer; a second insulation layer formed on the charge storage layer, the second insulation layer including a first high dielectric insulating film which has a higher relative permittivity than a silicon nitride film and a second high dielectric insulating film which has a higher relative permittivity than a silicon nitride film, the first and second high dielectric insulating films being structured so that a silicon oxide film is interposed therebetween; a control electrode formed on the second insulation layer; a first portion formed between the charge storage layer and the second insulation layer and containing silicon and nitrogen; and a second portion containing silicon and oxygen, the second portion being provided between the charge storage layer and the second insulation layer.