Patent ID: 7153715
Filing Date: 2006-12-26
Classification: B82Y,C30B,H01L,H01S

Abstract:
1. A method for fabricating a semiconductor device having a semiconductor layer formed by epitaxial growth from a single-crystal substrate, the method comprising the steps of: (a) forming a spacer layer having an optical band gap smaller than an optical band gap of a lowermost portion of the semiconductor layer such that an upper surface of the single-crystal substrate is covered with the spacer layer; (b) forming the semiconductor layer on the spacer layer; and (c) irradiating the spacer layer with a light beam having an energy smaller than an optical band gap of the single-crystal substrate and larger than the optical band gap of the spacer layer through a back surface of the single-crystal substrate to separate the semiconductor layer from the single-crystal substrate, wherein the step (a) includes a sub-step of forming a InGaN layer as the spacer layer, and the step (b) includes a sub-step of composing the lowermost portion of the semiconductor layer of an Al