Patent ID: 8952445
Filing Date: 2015-02-10
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device, comprising: a semiconductor substrate; a first insulating film formed on the semiconductor substrate; a charge storage film formed on the first insulating film; a second insulating film formed on the charge storage film; and a control electrode formed on the second insulating film, wherein the second insulating film has a laminated structure having a first silicon oxide film, a first silicon nitride film, and a second silicon oxide film, a first atom other than silicon is provided at an interface between the first silicon oxide film and the first silicon nitride film, and/or at an interface between the second silicon oxide film and the first silicon nitride film, the first atom being selected from the group consisting of aluminum, boron, and alkaline earth metals, the first atom forms an oxide film, and in the oxide film formed by use of the first atom, its surface contacting the first silicon oxide film or the second silicon oxide film is higher in oxygen density than the first silicon oxide film or the second silicon oxide film.