Patent ID: 7615467
Filing Date: 2009-11-10
Classification: H01L

Abstract:
1. A method for manufacturing an SOI wafer, the method comprising, in series: subjecting a mirror-polished active layer wafer having first and second surfaces to a rapid thermal annealing treatment in a nitridation gas atmosphere to form vacancy layers in surface portions of the first and second surfaces of the active layer wafer by implanting vacancies into the surface portions; subjecting said active layer wafer to a heat treatment in an oxidizing atmosphere to form: bonding the first surface of said active layer wafer and a surface of a support wafer with said insulating film therebetween, so as to form a bonded wafer; loading said bonded wafer on a wafer boat in a state such that a portion of said active layer wafer is in contact with said wafer boat, and then subjecting said bonded wafer to a heat treatment for bonding enhancement which enhances a bonding strength between said active layer wafer and said support wafer in said bonded wafer; and thinning said active layer wafer by removing the second insulating film, the second denuded zone, the bulk portion, and said bulk micro defect layers, of the active layer wafer, and to form an SOI wafer including the support wafer, the first insulating layer bound on the support wafer, and the first denuded zone formed on the first insulating layer.