Patent ID: 8501592
Filing Date: 2013-08-06
Classification: C30B

Abstract:
1. A III-nitride crystal manufacturing method comprising: a substrate-constituting step of preparing a III-nitride crystal starting substrate structured in a pattern of alternating first and second crystallographically distinct regions, by rendering the III-nitride crystal starting substrate such that the second regions are matrices and the first regions are inversion domains where <0001> directed polarity with respect to the matrices is inverted, wherein the pattern of first and second regions appears in a side of the starting substrate defining a major surface thereof; and a growth step of growing III-nitride crystal onto the starting substrate major surface to initially create over the first regions of the starting substrate first zones having high-density dislocations, and over the second regions of the starting substrate second zones having low-density dislocations, and of continuing the III-nitride crystal manufacturing so as to cover over and bury the first zones with the second zones, such that the III-nitride crystal possesses both regions having high-density dislocations and regions having low-density dislocations, and such that the ratio of the dislocation density of the high-dislocation-density regions to the crystal's average dislocation density is 2 or greater.