Patent ID: 8679881

Claim:
A growth method for reducing defect density of gallium nitride (GaN), comprising steps of: S 1 : sequentially forming a buffer growth layer and a stress release layer on a substrate; S 2 : forming a first nanometer cover layer on the stress release layer, wherein the first nanometer cover layer includes a plurality of openings interconnected with the stress release layer; S 3 : growing a first island in each of the openings, wherein the first island includes an annular tilted wall adjacent to the opening, and a top wall away from the first nanometer cover layer and connected to the tilted wall; S 4 : forming a first buffer layer on surfaces of the first nanometer cover layer and the first island; S 5 : forming a second nanometer cover layer at a position of the first buffer layer corresponding to the top wall, and defining a position of the first buffer layer not covered by the second nanometer cover layer as a connection growth region; S 6 : growing a second island on the connection growth region; S 7 : forming a second buffer layer on surfaces of the second nanometer cover layer and the second island; S 8 : completing growth of a dislocated island structure; and S 9 : forming a nitride semiconductor layer on the dislocated island structure which is a buffer for reducing defect density.