Patent ID: 9732435
Date: 2017-08-15
CPC Classifications: C30B

Claim:
1. A group 13 nitride crystal having a hexagonal crystal structure and containing at least a nitrogen atom and at least a metal atom selected from a group consisting of B, Al, Ga, In, and Tl, the group 13 nitride crystal comprising: a first region disposed on an inner side in a cross section intersecting c-axis; a third region disposed on an outermost side in the cross section and having a crystal property different from that of the first region; and a second region disposed at least partially between the first region and the third region in the cross section, the second region being a transition region of a crystal growth and having a crystal property different from that of the first region and that of the third region, wherein the metal atom includes Ga at least, wherein the crystal property includes a peak intensity ratio E1/E2 where E1 is a peak intensity of a first peak including a band edge emission of gallium nitride and E2 is a peak intensity of a second peak located at 600 nm, in an emission spectrum of the cross section excited by an electron beam or ultraviolet light, and for said first region, second region and third region, said peak intensity ratio E1/E2 satisfies the following formula (1): where A1 represents the peak intensity ratio E1/E2 of the first region, A2 represents the peak intensity ratio E1/E2 of the second region, and A3 represents the peak intensity ratio E1/E2 of the third region.