Patent ID: 7973356

Claim:
A nonvolatile semiconductor memory device, comprising: a semiconductor substrate; a first gate electrode formed on said semiconductor substrate through a gate insulating film; a second gate electrode, comprising a side portion, formed in a side direction of said first gate electrode and electrically insulated from said first gate electrode; and an electric charge trapping film formed at least between said semiconductor substrate and said second gate electrode to trap electric charge, wherein said first gate electrode comprises a lower portion contacting said gate insulating film and an upper portion above said lower portion of said first gate electrode, wherein a distance between said upper portion of said first gate electrode and said second gate electrode is greater than a distance between said lower portion of said first gate electrode and said second gate electrode, and wherein said electric charge trapping film and a spacer insulating film are sandwiched between said upper portion of said first gate electrode and said side portion of said second gate electrode.