Patent ID: 6861335
Filing Date: 2005-03-01
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 (b) includes forming a group III-V compound semiconductor layer as the semiconductor layer, wherein the step (a) includes forming a ZnO layer as the spacer layer and the step (b) includes composing the lowermost portion of the semiconductor layer of a group III-V compound material containing nitrogen and having an optical band gap larger than an optical band gap of the ZnO layer.