Patent ID: 9647106
Date: 2017-05-09
CPC Classifications: H01L

Claim:
1. A silicon carbide semiconductor device comprising a silicon carbide substrate having a main surface, said silicon carbide substrate including said main surface of said silicon carbide substrate being provided with a plurality of trenches, when viewed in a plan view, said plurality of trenches surround said contact region, a trench of said plurality of trenches having a side portion and a bottom portion, said side portion extending to said first impurity region through said third impurity region and said second impurity region, said bottom portion being located in said first impurity region, the silicon carbide semiconductor device further comprising: a gate insulating film in contact with said bottom portion, said side portion, and a corner portion formed by said side portion and said main surface; a gate electrode in contact with said gate insulating film within said trench; an interlayer insulating film that includes: a gate interconnection disposed in said first opening and in contact with said gate electrode, when viewed in a cross section, said interlayer insulating film extending from above said third impurity region to above said gate electrode so as to cover said corner portion, wherein said first width of said first opening is smaller than a width of an upper surface of said gate electrode, and wherein said second width of said second opening is larger than said width of said upper surface of said gate electrode.