Patent ID: 8624356
Filing Date: 2014-01-07
Classification: C30B,H01L

Abstract:
1. A group III nitride semiconductor substrate production method, comprising: preparing a bulk crystal comprising a group III nitride semiconductor single crystal, the group III nitride semiconductor single crystal comprising one crystalline face and an other crystalline face, a hardness of the other crystalline face being softer than a hardness of the one crystalline face; and cutting the prepared bulk crystal, in a cutting direction, from the other crystalline face to the one crystalline face of the bulk crystal, wherein the cutting is performed at an angle from not less than 0 to not more than 45 degrees between the cutting direction and the [0 0 0 1] direction, wherein the damaged layer depth caused by the cutting positioned in a surface of the group III nitride semiconductor substrate exposed after the cutting is not more than 50 μm from the surface.