Patent ID: 9543412
Date: 2017-01-10
CPC Classifications: H01L

Claim:
1. A silicon carbide semiconductor device, comprising: a silicon carbide substrate having an epitaxial layer; a trench formed at said epitaxial layer having a side wall surface, a bottom surface, and a first corner portion between said side wall surface and said bottom surface; a gate oxide film on an inner surface of said trench, said gate oxide film including a first portion extending on both said side wall surface and said bottom surface and a second portion on said first portion located on said bottom surface; and a gate electrode on said gate oxide film, said first portion having a second corner portion, covered with said second portion, at an upper surface of said first portion, said second portion having a third corner portion at an upper surface of said second portion, and a radius of curvature of said third corner portion being greater than a radius of curvature of said second corner portion.