Patent ID: 7854804

Claim:
A semiconductor device comprising, a nitride crystal substrate, or an epilayer-containing nitride crystal substrate including one or more semiconductor layer(s) formed by epitaxial growth on at least one of main surface sides of said nitride crystal substrate, and one or more semiconductor layer(s) formed by epitaxial growth on at least one of the main surface sides of said nitride crystal substrate or said epilayer-containing nitride crystal substrate, wherein on a diffraction intensity profile of arbitrary specific parallel crystal lattice planes of the nitride crystal obtained from X-ray diffraction measurement performed with variation of X-ray penetration depth from a surface of said crystal while X-ray diffraction conditions of said specific parallel crystal lattice planes being satisfied, an irregular distortion at a surface layer of said crystal represented by a value of |v 1 -v 2 | obtained from a half value width v 1 of a diffraction intensity peak at said X-ray penetration depth of 0.3 μm and a half value width v 2 of the diffraction intensity peak at said X-ray penetration depth of 5 μm is equal to or lower than 150 arcsec.