Patent ID: 7649221
Filing Date: 2010-01-19
Classification: H01L

Abstract:
1. A non-volatile semiconductor memory device comprising: a semiconductor substrate; a first insulating film formed on the semiconductor substrate; a memory cell transistor including a floating gate disposed on the first insulating film, a first inter-gate insulating film formed on the floating gate and a control gate formed on the first inter-gate insulating film; and a select gate transistor formed on the first insulating film adjacent to the memory cell transistor, the select gate transistor including a lower gate portion having an upper surface which has a first region and a second region, a second inter-gate insulating film formed on the first region of the upper surface, an upper gate portion, which has a first side surface, formed on the second inter-gate insulating film, a conductive oxide film formed on the second region of the flat upper surface and the first side surface, and a sidewall gate portion formed on the conductive oxide film, the sidewall gate portion including a second side surface facing to the first side surface of the upper gate portion via the conductive oxide film.