Patent ID: 7615464

Claim:
A method for minimizing or avoiding contamination of a final multilayer structure obtained by transfer of a thin layer from a donor wafer, which comprises: providing a donor wafer and a receiving handle wafer, each having a first surface prepared for bonding and a second surface, with the donor wafer including a zone of weakness that defines a thin layer of donor wafer material to be transferred to the receiving handle wafer; treating at least one of the first surfaces to provide increased bonding energy when the first surfaces are bonded together; bonding the first surfaces together to form an intermediate multilayer structure; transferring the thin layer to the receiving handle wafer to form a final multilayer structure by detachment at the zone of weakness and removal of remaining material of the donor wafer; and avoiding or minimizing contamination of the final multilayer structure by treating only the first surface of the donor wafer by exposure to a plasma prior to bonding and cleaning the contamination from the second surface of donor wafer after bonding but prior to detachment of the thin layer, or by treating both first surfaces by exposure to a plasma followed by cleaning contamination from the second surface of the receiving handle wafer after bonding but prior to detachment of the thin layer, or by treating the first surface of the receiving handle wafer by exposure to a plasma followed by cleaning the second surface of the receiving handle wafer after bonding but prior to detachment of the thin layer.