Patent ID: 8841681

Claim:
A wide-gap semiconductor substrate comprising: a narrow-gap semiconductor layer having a main surface; a wide-gap semiconductor layer which is epitaxially grown on the narrow-gap semiconductor layer; and an alignment mark which is preliminarily carved in a prescribed position on the main surface of the narrow-gap semiconductor layer so that the alignment mark is buried in the wide-gap semiconductor layer, wherein the narrow-gap semiconductor layer is a Si layer and the wide-gap semiconductor layer includes a nitride semiconductor layer which is made of at least one of a GaN layer and an AlGaN layer, the main surface of the narrow-gap semiconductor layer, which is not provided with the alignment mark, is fiat, and a first distance between the main surface of the narrow-gap semiconductor layer and a bottom of the alignment mark is d, a second distance between a main surface of the wide-gap semiconductor laver at a region provided with the alignment mark and the bottom of the alignment mark is 2d or more.