Patent ID: 8871610
Filing Date: 2014-10-28
Classification: H01L

Abstract:
1. A method for forming an SOI substrate comprising the steps of: performing a first radical treatment on a semiconductor substrate to form a silicon oxide film; performing a second radical treatment on the semiconductor substrate to nitride the silicon oxide film, so that a first insulating film comprising silicon oxynitride is formed on the semiconductor substrate; irradiating the semiconductor substrate with ions through the first insulating film to form an embrittlement region in the semiconductor substrate; forming a second insulating film over the first insulating film, after the step of irradiating; bonding a surface of the second insulating film and a surface of a base substrate, after the step of forming the second insulating film; performing heat treatment to form a semiconductor layer over the base substrate by separating the semiconductor substrate along the embrittlement region, after the step of bonding; etching the semiconductor layer over the base substrate; and irradiating the semiconductor layer with a laser beam, after the step of etching.