Patent ID: 8969157
Filing Date: 2015-03-03
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a trench in the direction of a lower surface from an upper surface of a semiconductor layer; forming a first insulating film to cover an inner surface of the trench and the upper surface of the semiconductor layer; forming an electrode material to cover the first insulating film; selectively removing the electrode material except a portion of the electrode material to fill the trench and a portion of the electrode material to cover an opening of the trench; removing a portion of the first insulating film on the upper surface of the semiconductor layer, and a portion of the first insulating film in the trench; etching back the portion of the electrode material which covers the opening of the trench and the portion of the electrode material to fill the trench to form a first electrode at an lower portion of the trench; forming a second insulating film to cover an inner surface of the upper portion of the trench, and a third insulating film to cover an end portion of the first electrode exposed from the first insulating film at the upper portion of the trench; and forming a second electrode above the first electrode through the third insulating film.