Patent ID: 8119490
Filing Date: 2012-02-21
Classification: H01L

Abstract:
1. A method for manufacturing an SOI substrate, comprising: forming an oxide film containing a chlorine atom over a single crystal semiconductor substrate; irradiating the single crystal semiconductor substrate with an accelerated ion through the oxide film to form an embrittled region in a region at a predetermined depth from a surface of the single crystal semiconductor substrate; performing plasma treatment of the oxide film over the single crystal semiconductor substrate by applying a bias voltage; disposing the single crystal semiconductor substrate and a base substrate made from an insulator opposite to each other to bond a surface of the oxide film and a surface of the base substrate to each other; and performing heat treatment to cause separation along the embrittled region after bonding the surface of the oxide film and the surface of the base substrate to each other, thereby forming a single crystal semiconductor film over the base substrate with the oxide film interposed therebetween, wherein concentration of chlorine is higher in an interface between the oxide film and the single crystal semiconductor film than in an interface between the oxide film and the base substrate.