Patent ID: 8268705

Claim:
A method for producing an SOI wafer, comprising at least the steps of: preparing a base wafer and a bond wafer each made of silicon single crystal; forming an insulator film on a surface of at least one of the base wafer and the bond wafer; forming an ion-implanted damaged layer by ion-implanting a neutral element electrically inactive in silicon from a surface of the base wafer or the bond wafer; bonding, at the ion-implanted surface, the base wafer and the bond wafer via the insulator film; and thinning the bond wafer bonded, wherein the neutral element for ion-implanting is argon; ion-implanting of the neutral element in the step of forming the ion-implanted damaged layer is performed at a dosage of 1×10 12 atoms/cm 2 or more and 1×10 13 atoms/cm 2 or less; and an acceleration voltage upon ion-implanting the neutral element is 200 keV or less.