Patent ID: 7816238
Filing Date: 2010-10-19
Classification: C30B,H01L,Y10S

Abstract:
1. A method of manufacturing a GaN substrate comprising the steps of: preparing a base substrate having a reference plane direction inclined in an inclined direction of said base substrate with respect to a normal vector of a main surface; forming a mask layer having a pattern on said main surface of said base substrate; growing a GaN crystal layer on said main surface of said base substrate on which said mask layer is formed; and providing a GaN substrate containing the GaN crystal layer by removing said base substrate from said GaN crystal layer, wherein said GaN substrate has a main surface, and a plane direction [0001] thereof is inclined in an off-angle direction with respect to a normal vector of said main surface, and an inclined angle in said off-angle direction of said plane direction [0001] in said GaN substrate is adjusted by changing an inclined angle of said reference plane direction in the inclined direction of said base substrate in said base substrate, wherein said reference plane direction is inclined in said two different inclined directions of said base substrate with respect to the normal vector of said main surface in the step of preparing said base substrate, and said plane direction [0001] is inclined in said two different off-angle directions with respect to the normal vector of said main surface in said GaN substrate, wherein one of inclined angles in said two inclined directions of said base substrate in said base substrate is 10° to 40°, and the other is 0.02° to 40°, and wherein the two off-angle directions of said plane direction [0001] inclined with respect to the normal vector of the main surface are a [1-100] direction and a [11-20] direction.