Patent ID: 9293604
Filing Date: 2016-03-22
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 and including the memory cell, and 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 including the memory cell, 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 over the first insulating film, and a third insulating film over the second insulating film; wherein the second insulating film is an insulating film having a charge accumulation function and the band gap of each of the first insulating film and the third insulating film is greater than the band gap of the second insulating film; wherein an angle made between a portion of the second insulating film extending between the semiconductor substrate and the second electrode and a portion of the second insulating film extending between the first gate electrode and the second gate electrode is 90° or greater; and wherein an inner angle of a first corner portion formed by a first surface of the second gate electrode on a side facing to the semiconductor substrate and a second surface of the second gate electrode on a side facing to the first gate electrode is less than 90°.