Patent ID: 8344442

Claim:
A nonvolatile semiconductor memory, comprising: a floating gate electrode formed on a gate insulating film on an element region isolated by an element isolation region on a semiconductor substrate; an inter-gate insulating film formed to cover a portion from an upper surface of said floating gate electrode; and a control gate electrode formed on said floating gate electrode via said inter-gate insulating film, wherein a portion of the side surface of said floating gate electrode which is covered with said inter-gate insulating film has a shape in which, toward the upper surface, an inclination angle of the side surface of said floating gate electrode to a direction perpendicular to a surface of said semiconductor substrate increases, different from the other portion of the side surface of said floating gate electrode, the inclination angle of the side surface of said floating gate electrode to a direction perpendicular to a surface of said semiconductor substrate increases at a lower portion of contacting said floating gate electrode and said inter-gate insulating film, wherein an upper surface of said floating gate electrode that is covered with said inter-gate insulating film has a round-arched shape up to a center of the upper surface.