Patent ID: 8809945

Claim:
A semiconductor device comprising: a substrate made of silicon carbide and provided with a trench that has a wall surface having an off angle of not less than 50° and not more than 65° relative to a {0001} plane and that has an opening at a side of one main surface thereof; an oxide film formed on and in contact with said wall surface of said trench; and an electrode disposed on and in contact with said oxide film, said substrate including a source region having first conductivity type and formed to include said one main surface and said wall surface, a body region having second conductivity type and formed to include said wall surface and make contact with said source region, and a drift region having the first conductivity type and formed to include said wall surface and make contact with said body region so as to sandwich said body region between said source region and said drift region, said source region and said body region being formed by means of ion implantation, said body region having a region that is sandwiched between said source region and said drift region and that has a thickness of 1 μm or smaller in a direction perpendicular to said one main surface, said body region having an impurity concentration of 3×10 17 cm −3 or greater.