Patent ID: 7365363

Claim:
A silicon carbide semiconductor device comprising: a semiconductor substrate made of single crystal silicon carbide and having a principal surface and a backside surface opposite to the principle surface; a drift layer made of a first conductive type silicon carbide, disposed on the principal surface of the semiconductor substrate, and having a dopant concentration lower than a dopant concentration of the semiconductor substrate; a base region having a second conductive type, disposed on a predetermined area of the drift layer, and having a predetermined thickness; a source region having the first conductive type, disposed on a predetermined surface portion of the base region, and being shallower than a depth of the base region; a surface channel layer made of the first conductive type silicon carbide, disposed on surface portions of both of the drift layer and the base region, and having a predetermined concentration and a predetermined thickness for connecting between the source region and the drift layer; a gate insulation film disposed on a surface of the surface channel layer and including a high dielectric constant film; a gate electrode disposed on the gate insulation film; a source electrode disposed on the source region; and a backside electrode disposed on the backside surface of the semiconductor substrate, wherein the principal surface includes at least two surfaces, one of which is tilted from a (0001)-Si surface by an angle in a range between 10 degrees and 20 degrees, and the other one of which is the (0001)-Si surface.