Patent ID: 9406813
Filing Date: 2016-08-02
CPC Classification: H01L

Claim Text:
1. A semiconductor device having a memory cell of a nonvolatile memory, comprising: a semiconductor substrate; a first gate electrode formed over the semiconductor substrate via a first gate insulating film; a second gate electrode formed over the semiconductor substrate via a stacked insulating film, adjacent to the first gate electrode via the stacked insulating film; and a sidewall spacer formed over the semiconductor substrate such that the sidewall spacer is arranged opposite to the first gate electrode via the second gate electrode as viewed in a cross section, wherein the stacked insulating film extends over between the semiconductor substrate and the second gate electrode and between the first gate electrode and the second gate electrode, wherein the stacked insulating film has a first insulating film, a second insulating film and a third insulating film, wherein the second insulating film is an insulating film having a charge accumulation function and is arranged between the first insulating film and the third insulating film, and wherein, as viewed in a cross section, a first portion of the third insulating film under the second gate electrode tapers from the sidewall spacer toward the first gate electrode.