Patent ID: 8691645

Claim:
A method of manufacturing a semiconductor device, comprising: forming a plurality of bit lines on a substrate; forming an insulating layer between the plurality of bit lines, the insulating layer comprising opposing side surfaces and wherein an upper surface of the insulating layer is higher than upper surfaces of the plurality of bit lines; forming a plurality of channel layers on the opposing side surfaces of the insulating layer; forming a tunnel oxide film over the plurality of channel layers, the tunnel oxide film comprising top, bottom, and side surfaces, wherein a portion of the tunnel oxide film is disposed over a top surface of the insulating layer; forming a plurality of charge storage layers on opposite side surfaces of the plurality of channel layers from the side surfaces on which the insulating film is formed; and forming a top oxide film over the tunnel oxide film and the plurality of charge storage layers, the top oxide film comprising top, bottom, and side surfaces, wherein the plurality of charge storage layers is provided between the side surfaces of the top oxide film and side surfaces of the tunnel oxide film, further wherein at least a portion of the bottom surface of the top oxide film is in direct contact with the top surface of the tunnel oxide film.