Patent ID: 9290861
Filing Date: 2016-03-22
CPC Classification: C30B,H01L

Claim Text:
1. A group 13 nitride crystal grown by a flux method on the principal surface of a base substrate comprising a seed crystal layer of a group 13 nitride, wherein a principal surface includes a plurality of steps having a height difference on the order of micrometers, said steps formed into a pattern taking on a shape with a concave shape in the center when a vertical cross-section of the base substrate is observed and taking on a point-symmetry figure when the base substrate is observed from the upper surface, wherein when a cross-section of the group 13 nitride crystal cut along the {1-100} plane is observed, a grain boundary starts from the height difference of the base substrate and extends obliquely in a direction inclined 55° to 75° relative to the <0001> direction in a single crystal.