Patent ID: 9508837
Filing Date: 2016-11-29
CPC Classification: H01L

Claim Text:
1. A method of manufacturing a semiconductor device, comprising the steps of: (a) forming a first conductive film in a first region of a semiconductor substrate via a first insulating film having therein a charge accumulation portion; (b) successively forming a second insulating film and a second conductive film over the semiconductor substrate, over the first conductive film and over the side surface thereof; (c) etching the second insulating film and the second conductive film to leave, via the second insulating film, the second conductive film in a second region adjacent to the first region, with the second insulating film covering a corner of a lower portion of the second conductive film at a side adjacent to the first region; and (d) forming a third insulating film over the semiconductor substrate and the second conductive film, wherein the second insulating film has a high dielectric constant film having a dielectric constant higher than that of a silicon nitride film.