Patent ID: 8471365
Filing Date: 2013-06-25
Classification: C30B,H01L,Y10T

Abstract:
1. A nitride semiconductor substrate comprising: a main surface inclined at an angle of 71° or more and 79° or less with respect to a (0001) plane toward a [1-100] direction or inclined at an angle of 71° or more and 79° or less with respect to a (000-1) plane toward a [−1100] direction; and a chamfered portion located at an edge of an outer periphery of said main surface, said chamfered portion being inclined at an angle of 5° or more and 45° or less with respect to adjacent one of said main surface and a backside surface on a side opposite to said main surface, said chamfered portion includes a topside chamfer formed on the main surface side and a backside chamfer formed on the backside surface side, and a damaged layer formed in the topside chamfer has a thickness greater than that of a damaged layer formed in the backside chamfer.