Patent ID: 9257446
Filing Date: 2016-02-09
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor substrate; a first gate electrode arranged over the semiconductor substrate; a second gate electrode arranged over the semiconductor substrate so as to be adjacent to the first gate electrode; a first insulating film formed between the first gate electrode and the semiconductor substrate; a second insulating film formed such that the second insulating film extends from between the second gate electrode and the semiconductor substrate to between the first gate electrode and the second gate electrode, the second insulating film having a charge accumulation portion; and a third insulating film formed such that the third insulating film extends from between the first gate electrode and the first insulating film to between the first gate electrode and the second insulating film, wherein the third insulating film covers a corner portion of a lower portion of the first gate electrode on a second gate electrode side, wherein the first insulating film includes a silicon oxide film, and wherein the third insulating film has a dielectric constant higher than that of a silicon nitride film.