Patent ID: 8691665

Claim:
A method for producing a bonded wafer, the method in which an ion implanted layer is formed by implanting a gas ion of at least one of a hydrogen ion and a rare gas ion from a surface of a bond wafer, a bonded wafer having a thin film on a base wafer is made by bonding the ion implanted surface of the bond wafer and a surface of a base wafer directly or through an oxide film and then delaminating the bond wafer at the ion implanted layer, and heat treatment for flattening the surface of the thin film is then performed on the bonded wafer in an atmosphere containing hydrogen or hydrogen chloride, wherein the surface of a susceptor on which the bonded wafer is to be placed, the susceptor used at the time of the flattening heat treatment, is coated with a silicon film in advance, and in the surface of a bonded wafer-placing surface side of the susceptor, the silicon film with which the susceptor is coated coats a surface other than a region in which a back surface of the bonded wafer is to make contact with the susceptor.