Patent ID: 7550801

Claim:
A nonvolatile semiconductor memory device comprising: a tunnel insulating film which is formed on a surface of a semiconductor substrate; a floating gate electrode which is formed on the tunnel insulating film, at least an interface region which the floating gate electrode defines on a side opposite to that of the substrate, being made of n-type Si or metal-based conductive material; an inter-electrode insulating film which is formed on the floating gate electrode and which is made of high-permittivity material, the high-permittivity material being oxide, nitride or oxinitride containing at least one element selected from the group consisting of Al, Hf, La, Y, Ce, Ti, Zr, Si, and Ta; a control gate electrode which is formed on the inter-electrode insulating film, at least an interface region of which the control gate electrode defines on a side of the inter-electrode insulating film, being made of a p-type semiconductor layer containing at least one of Si and Ge; and an n-type source/drain region formed in the surface of the semiconductor substrate.