Patent ID: 6720640
Filing Date: 2004-04-13
Classification: H01L,Y10S

Abstract:
A method for reclaiming a delaminated wafer produced as a by-product in the production of bonded wafer by the ion implantation and delamination method comprising:implanting gas ions from a top surface of a wafer, at a peripheral portion of which a chamfered portion is provided, to form a micro bubble layer; bringing the ion-implanted wafer into close contact with another wafer; and subjecting the wafers brought into close contact to a heat treatment to delaminate the wafers at the micro-bubble layer as a border, wherein a portion from the top surface to the micro-bubble layer on the chamfered portion of the delaminated wafer, which was not bonded to the other wafer and remains on the delaminated wafer, is removed by subjecting, the delaminated wafer to another heat treatment, and then a surface of the wafer is polished.