Patent ID: 7867877
Filing Date: 2011-01-11
Classification: H01L,Y10S

Abstract:
1. A method for manufacturing SOI wafers in which a laminated wafer is formed by laminating an active layer wafer to a base wafer with an insulating film interposed therebetween, followed by reducing the thickness of the active layer wafer side to produce an SOI wafer, comprising the steps of: implanting oxygen ions into the active layer wafer to form an oxygen ion implanted layer on the active layer wafer; reducing the oxygen in the vicinity of the surface layer of the active layer wafer by out diffusion by heat treating the active layer wafer on which the oxygen ion implanted layer has been formed in a reducing atmosphere; forming a laminated wafer by laminating the active layer wafer onto a base wafer with an insulating film interposed therebetween; allowing a portion of the active layer wafer to remain on the surface side of the oxygen ion implanted layer by grinding the active layer wafer portion of the laminated wafer; exposing the oxygen ion implanted layer by polishing or etching a portion of the remaining active layer wafer; forming an oxide film of a predetermined thickness on the exposed surface of the oxygen ion implanted layer by oxidation treatment of the laminated wafer; removing the oxide film, and removing the oxygen ion implanted layer by etching.