Patent ID: 8551862
Filing Date: 2013-10-08
Classification: H01L

Abstract:
1. A method of manufacturing a laminated wafer by forming a silicon film layer on a surface of an insulating sapphire wafer, quartz wafer or alumina wafer substrate, the method comprising the steps in the following order of: applying a surface activation treatment to a surface of a silicon wafer or to a surface of a silicon wafer covered with an oxide film, and to the surface of the insulating sapphire wafer, quartz wafer or alumina wafer substrate; bonding the surfaces to each other in an atmosphere of temperature exceeding 50° C. and lower than 300° C.; subjecting the bonded substrates to a heat treatment of 200° C. to 350° C. wherein the temperature for subjecting the bonded surfaces to a heat treatment is higher than the temperature for bonding the surfaces to each other by 50° C. to 150° C.; and thinning the silicon wafer by a combination of grinding, etching and polishing to form the silicon film layer on the insulating sapphire wafer, quartz wafer or alumina wafer substrate.