Patent ID: 6864158
Filing Date: 2005-03-08
Classification: C30B,H01L

Abstract:
1. A method of manufacturing a nitride semiconductor substrate, comprising: a first step of selectively forming a raised and recessed region in an upper portion of a base substrate; a second step of growing a semiconductor layer of nitride on said raised and recessed region in said upper portion of said base substrate so that a recessed portion in said raised and recessed region is filled and the upper surface thereof is even; and a third step of irradiating an interface between said semiconductor layer and said base substrate with a laser beam, thereby separating said semiconductor layer from said based substrate to form a semiconductor substrate from said semiconductor layer, wherein in said third step, the laser beam is irradiated upon said semiconductor layer from the surface opposite to the upper portion of said base substrate, so as to generate cracks at the interface between the top of the raised portion of the base substrate and the semiconductor layer.