Patent ID: 7713842
Filing Date: 2010-05-11
Classification: H01L

Abstract:
1. A method for producing a bonded wafer by bonding a wafer for active layer to wafer for support layer with or without an insulating film and then thinning the wafer for active layer, which comprises a series of steps of: (1) implanting oxygen ions into a wafer for active layer; (2) bonding the wafer for active layer to a wafer for support layer with or without an insulating layer; (3) heat-treating for increasing a bonded strength; (4) thinning the wafer for active layer in the bonded wafer to expose the oxygen ion implanted layer; (5) removing the oxygen ion implanted layer in the wafer for active layer by oxidation or grinding; and (6) planarizing and/or thinning the surface of the wafer for active layer by heat treatment and/or grinding, wherein a terrace grinding for forming a terrace portion is carried out prior to the step (4) of exposing the oxygen ion implanted layer.