Patent ID: 8017990

Claim:
A nonvolatile semiconductor memory device comprising: a semiconductor substrate; a gate insulating film formed on the semiconductor substrate; a first gate electrode corresponding to a memory cell transistor, including a floating gate electrode film formed on the gate insulating film, a first interelectrode insulating film formed on the floating gate electrode film and a control gate electrode film formed on the first interelectrode insulating film, the floating gate electrode film having a polycrystalline silicon film and the control gate electrode film having a silicide film; and a second gate electrode including a lower electrode film formed on the gate insulating film, a second interelectrode insulating film formed on the lower electrode film and an upper electrode film formed on the second interelectrode insulating film, wherein: the second interelectrode insulating film includes an opening, the lower electrode film includes a void below the opening of the second interelectrode insulating film, the upper electrode film includes a silicide film, the lower electrode film includes a polycrystalline silicon film and a silicide film which is located between the opening and the void.