Patent ID: 8686435

Claim:
A silicon carbide semiconductor device comprising: a substrate made of silicon carbide having a hexagonal crystal structure and having a main surface; a silicon carbide layer epitaxially formed on said main surface of said substrate, said silicon carbide layer being provided with a trench having a side wall inclined relative to said main surface, said side wall having an off angle of not less than 50Â° and not more than 65Â° relative to a {0001} plane; a gate insulating film provided on said side wall of said silicon carbide layer; and a gate electrode provided on said gate insulating film, said silicon carbide layer including a body region having a first conductivity type and facing said gate electrode with said gate insulating film being interposed therebetween, a channel region formed at a surface of said body region along said side wall, and a pair of regions separated from each other by said body region and having a second conductivity type, said body region having an impurity density of 5Ã—10 16 cm âˆ’3 or greater such that said gate electrode has a threshold voltage which allows a weak inversion layer to be formed in said body region, said threshold voltage being 2 V or greater in a temperature range of not less than a room temperature and not more than 100Â° C. and such that channel mobility of electrons is 30 cm 2 /Vs or greater at the room temperature.