Patent ID: 7999304

Claim:
A semiconductor device comprising: a semiconductor substrate; and a plurality of nonvolatile memory cells provided on the semiconductor substrate, each of the plurality of nonvolatile memory cells comprising: a channel region provided on the semiconductor substrate and having a channel length and a channel width; a tunnel insulating film provided on the channel region; a floating gate electrode provided on the tunnel insulating film; a control gate electrode provided above the floating gate; an inter-electrode insulating film provided between the floating gate electrode and the control gate electrode; and an electrode side-wall insulating film provided on side-wall surfaces of the floating gate electrode and the control gate electrode, the inter-electrode insulating film including a first insulating film having a first dielectric constant and a second insulating film having a second dielectric constant, the first dielectric constant being higher than the second dielectric constant, the second dielectric constant being higher than a dielectric constant of a silicon nitride film, the first insulating film being provided in a central region of a facing region between the floating gate electrode and the control gate electrode, the second insulating film being provided in both end regions of the facing region and protruding from the both end regions, wherein the central region is a region of the facing region except for the both end regions.