Patent ID: 8124504

Claim:
A GaN single crystal growth method comprising: a chromium layer growth process of growing a chromium layer on an underlying substrate; a nitridation process of forming a chromium nitride layer by nitriding at least a surface of the chromium layer; a GaN buffer layer growth process of growing a GaN buffer layer on the chromium nitride layer; and a GaN layer growth process of growing a high temperature single-crystal GaN layer on the GaN buffer layer, wherein the chromium nitride layer has (111) orientation, and wherein, in the GaN buffer layer growth process, the GaN buffer layer is grown at a temperature of 800° C. to 1,000° C., and, in the GaN layer growth process, the high-temperature single-crystal GaN layer is grown at not less than 1,000° C. and higher than the growth temperature of the GaN buffer layer.