Patent ID: 8138064

Claim:
A method for producing a silicon film-transferred insulator wafer, the method comprising: a surface activation step of performing a surface activation treatment on at least one of a surface of an insulator wafer and a hydrogen ion-implanted surface of a single crystal silicon wafer into which a hydrogen ion has been implanted to form a hydrogen ion-implanted layer; a bonding step of bonding the hydrogen ion-implanted surface to the surface of the insulator wafer to obtain bonded wafers; a first heating step of heating the bonded wafers at a first temperature; a grinding and/or etching step of grinding and/or etching a surface of a single crystal silicon wafer side of the bonded wafers thus heated so as to thin the single crystal silicon wafer of the bonded wafers; a second heating step of heating the bonded wafers thus ground and/or etched at a second temperature which is higher than the first temperature; and a detachment step of performing detachment at the hydrogen ion-implanted layer by applying a mechanical impact to the hydrogen ion-implanted layer of the bonded wafers thus heated at the second temperature, wherein after said grinding and/or etching step and before said second heating step, a mirror finish step of polishing the ground and/or etched surface of the single crystal silicon wafer side of the bonded wafers into a mirror surface.