Patent ID: 8829530
Filing Date: 2014-09-09
Classification: C30B,H01L,Y10T

Abstract:
1. A method for producing a columnar-shaped group-III nitride crystal, the method comprising: (a) obtaining a first group-III nitride crystal, grown by a flux method at a first crystal-growth speed, and having a dislocation density equal to or less than 10 (b) growing a second group-III nitride crystal at a second crystal-growth speed, by vapor phase epitaxy method on a surface of the first group-III nitride crystal having the dislocation density equal to or less than 10 wherein the second crystal-growth speed is faster than the first crystal-growth speed, and wherein the first group-III nitride crystal is in a columnar shape, in which a length in a c-axis direction is longer than a length in an a-axis direction.