Patent ID: 8003483
Filing Date: 2011-08-23
Classification: H01L

Abstract:
1. A method for manufacturing an SOI substrate comprising the steps of: forming an insulating film on a surface of a single crystal semiconductor substrate; forming a fragile region in the single crystal semiconductor substrate by irradiating the single crystal semiconductor substrate with an ion beam through the insulating film; forming a bonding layer over the insulating film; bonding a supporting substrate to the single crystal semiconductor substrate by interposing the bonding layer between the supporting substrate and the single crystal semiconductor substrate; dividing the single crystal semiconductor substrate at the fragile region to separate the single crystal semiconductor substrate into a single crystal semiconductor layer attached to the supporting substrate; performing a first dry etching treatment on a part of the fragile region remaining on the single crystal semiconductor layer, whereby a native oxide film is formed on a surface of the single crystal semiconductor layer; performing a second dry etching treatment to remove the native oxide film formed on the surface of the single crystal semiconductor layer; and irradiating the single crystal semiconductor layer with a laser light after the second dry etching treatment.