Patent ID: 6627520
Filing Date: 2003-09-30
Classification: C30B,H01L,H01S

Abstract:
A method for manufacturing a nitride semiconductor substrate comprising:forming a protective film including a plurality of windows of stripe, grid and/or island configuration on a supporting substrate; laterally growing a first nitride semiconductor layer over said protective film from a plurality of exposed portions of said supporting substrate, the growth being stopped in such a state that films of said first nitride semiconductor layer growing laterally from respective starting points do not join together but oppose each other via respective clearances; removing at least a part of said protective film; and growing a second nitride semiconductor layer laterally from the top surface or the top and side surface of said first nitride semiconductor layer to cover clearance(s) defined in said first nitride semiconductor layer so that cavities are formed below respective portions of the second nitride semiconductor layer which cover clearances defined in said first nitride semiconductor layer.