Patent ID: 8546245
Filing Date: 2013-10-01
Classification: H01L

Abstract:
1. A method for manufacturing a bonded wafer by forming a wide bandgap semiconductor film on a surface of a handle substrate, the method comprising the steps of: implanting ions from a surface of a wide bandgap semiconductor substrate having a bandgap of 2.8 eV or more to form an ion-implanted layer; applying a surface activation treatment to at least one of the surface of the handle substrate and the ion-implanted surface of the wide bandgap semiconductor substrate; bonding the surface of the wide bandgap semiconductor substrate and the surface of the handle substrate to obtain the bonded substrates; applying a heat treatment at 150° C. or more and 400° C. or less to the bonded substrates; and subjecting the ion-implanted layer of the wide bandgap semiconductor substrate to irradiation of visible light from the semiconductor substrate side of the bonded substrates to embrittle an interface of the ion-implanted layer and transfer the wide bandgap semiconductor film onto the handle substrate.