Patent ID: 8513676

Claim:
A semiconductor device comprising: a substrate made of silicon carbide and having a main surface having an off angle of not less than −3° and not more than +5° relative to a (0-33-8) plane in a <01-10> direction; a semiconductor layer made of silicon carbide and formed on said main surface of said substrate by means of epitaxial growth; and an insulating film formed in contact with a surface of said semiconductor layer, a maximum value of nitrogen atom concentration being 1×10 21 cm −3 or greater in a region within 10 nm from an interface between said semiconductor layer and said insulating film, said semiconductor layer being made of silicon carbide of 4H type, and when photoluminescence measurement is performed for said semiconductor layer, a ratio of strength of a peak appearing in a wavelength of around 500 nm to strength of a peak appearing in a wavelength of around 390 nm being 0.1 or smaller.