Patent ID: 7776154
Filing Date: 2010-08-17
Classification: C30B,H01L,Y10T

Abstract:
1. A method of forming a substantially crack free monocrystalline layer of gallium nitride or a mixed nitride of gallium and another metal on a substrate that could cause tension stresses in the layer, the method comprising the steps of: a) providing a substrate; b) disposing a buffer layer on the substrate; c) forming a nitride layer on the buffer layer, the nitride layer including at least one of (i) gallium nitride and (ii) a mixed nitride of gallium and another metal; and d) disposing at least one monocrystalline intermediate layer within the nitride layer, wherein the monocrystalline intermediate layer (i) is monocrystalline as deposited, (ii) has a thickness between about 100 and about 300 nm and (iii) has a lattice parameter smaller than a lattice parameter of the nitride of the nitride layer.