Patent ID: 8222674

Claim:
A semiconductor device comprising a silicon single crystal substrate, a silicon carbide layer provided on a surface of the substrate, a Group III nitride semiconductor junction layer provided in contact with the silicon carbide layer, and a superlattice-structured layer constituted by Group III nitride semiconductors on the Group III nitride semiconductor junction layer, wherein the silicon carbide layer is a layer of a cubic system whose lattice constant exceeds 0.436 nm and is not more than 0.460 nm and which has a nonstoichiometric composition containing silicon abundantly in terms of composition, and the Group III nitride semiconductor junction layer has a composition of Al x Ga Y In z N 1-α M α (0≦X, Y, Z≦1, X+Y+Z=1, 0≦α<1, M is a Group V element except nitrogen).