Patent ID: 8107507

Claim:
A group III nitride semiconductor device, comprising: a supporting base having a primary surface, the primary surface comprising a hexagonal compound, the primary surface tilting by an off-angle of 10 degrees or more and less than 80 degrees with reference to a c-plane of the hexagonal compound; and a semiconductor region provided on the primary surface of the supporting base, the semiconductor region comprising a semiconductor layer, the semiconductor layer comprising a hexagonal gallium nitride-based semiconductor different from the hexagonal compound, a tilt angle between a (0001) plane of the hexagonal compound of the supporting base and a (0001) plane of the hexagonal gallium nitride-based semiconductor of the semiconductor layer being in a range of +0.05 degree to +2 degrees and −0.05 degree to −2 degrees, and the hexagonal gallium nitride-based semiconductor of the semiconductor layer comprising AlInGaN.