Patent ID: 6440214
Filing Date: 2002-08-27
Classification: C30B,H01L

Abstract:
A method of growing a nitride semiconductor layer by molecular beam epitaxy, the method comprising the steps of:a) disposing a substrate in a vacuum chamber; b) growing a layer of GaxAl1âˆ’xN (0&lE;x&lE;1) on the substrate by molecular beam epitaxy; c) annealing the GaxAl1âˆ’xN layer to change from polycrystalline to mono-crystalline in crystal structure; and d) growing a nitride semiconductor layer on the GaxAl1âˆ’xN layer by molecular beam epitaxy at a V/III molar ratio within the vacuum chamber of 100:1 or greater; wherein the method further comprises supplying ammonia gas to the vacuum chamber in step (b) and step (d).