Patent ID: 8192543

Claim:
A method of manufacturing a semiconductor device including a nitride crystal substrate, the method comprising steps of: selecting, as said nitride crystal substrate, nitride crystal configured such that, in connection with plane spacing of arbitrary specific parallel crystal lattice planes of said crystal obtained from X-ray diffraction measurement performed with variation of X-ray penetration depth from a surface of said crystal while satisfying X-ray diffraction conditions of said specific parallel crystal lattice plane, a uniform distortion at a surface layer of said crystal represented by a value of |d 1 −d 2 |/d 2 obtained from said plane spacing d 1 at said X-ray penetration depth of 0.3 μm and said plane spacing d 2 at the X-ray penetration depth of 5 μm is equal to or lower than 2.1×10 −3 ; and epitaxially growing one or more semiconductor layer(s) on at least one of main surface sides of said nitride crystal substrate.