Patent ID: 8097523

Claim:
A method for manufacturing a bonded wafer, the method including at least the steps of implanting at least one type of gas ion selected from a hydrogen ion and a rare gas ion into a surface of a bond wafer to form an ion-implanted layer in the bond wafer, bonding an ion-implanted surface of the bond wafer to a surface of a base wafer through an insulator film, and then delaminating the bond wafer at the ion-implanted layer to fabricate a bonded wafer, the method further comprising applying a plasma treatment to a bonding surface of the base wafer to grow an oxide film; performing an etching treatment to the grown oxide film to reduce a film thickness of the oxide film by 0.3 nm or above and less than 2 nm; and then bonding the oxide film of the base wafer, that was subjected to the etching treatment, to the bond wafer that was ion-implanted.