Patent ID: 9708735
Date: 2017-07-18
CPC Classifications: C30B,Y10T

Claim:
1. A semiconductor device comprising a group III nitride crystal substrate and at least one semiconductor layer provided by epitaxial growth on a main surface of said crystal substrate, wherein, a plane spacing of arbitrary specific parallel crystal lattice planes of said crystal substrate being obtained from X-ray diffraction measurement performed with variation of X-ray penetration depth from a main surface of said crystal substrate while X-ray diffraction conditions of said specific parallel crystal lattice planes of said crystal substrate are satisfied, a uniform distortion at a surface layer of said crystal substrate represented by a value of |d a plane orientation of said main surface has an inclination angle equal to or greater than −10° and equal to or smaller than 10° in a [0001] direction with respect to any of {10-10}, {11-20} and {21-30} planes of said crystal substrate, wherein said semiconductor layer includes a light emitting layer emitting light having a peak wavelength equal to or more than 500 nm and equal to or less than 550 nm.