Patent ID: 8513090
Filing Date: 2013-08-20
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor substrate, comprising the steps of: forming a conductivity region on a surface of a silicon carbide substrate; adding ions to the silicon carbide substrate to form an embrittlement region in the silicon carbide substrate; bonding the silicon carbide substrate to a base substrate with an insulating layer interposed between the silicon carbide substrate and the base substrate; heating the silicon carbide substrate and separating the silicon carbide substrate at the embrittlement region to form the conductivity region and a silicon carbide layer over the base substrate with the insulating layer interposed between the base substrate and the conductivity region; and performing heat treatment on the silicon carbide layer to reduce defects in the silicon carbide layer, wherein the conductivity region is formed using a material containing silicon, and wherein the insulating layer is formed by thermal oxidation treatment of the conductivity region.