| 摘要 |
A method of manufacturing a semiconductor device includes forming a gate insulating film on a semiconductor substrate, forming a gate electrode film on the gate insulating film, and forming a plurality of trenches by etching the gate electrode film, the gate insulating film and the semiconductor substrate so that an upper portion of the gate electrode film includes a tapered side surface and a lower portion of the gate electrode film includes a side surface perpendicular to a surface of the semiconductor substrate. The method also includes forming an element isolation insulating film in the trenches, including forming a deposition type insulating film in the trenches and forming a coating type insulating film on the deposition type insulating film, and removing the element isolation insulating film by a dry etching method so that the tapered side surfaced of the gate electrode film is exposed and the perpendicular side surface of the gate electrode film is covered by the element isolation insulating film.
|
