Patent ID: 8349704

Claim:
A method for manufacturing an SOI substrate, comprising the steps of: forming an embrittled region in a single crystal semiconductor substrate by irradiating the single crystal semiconductor substrate with an accelerated ion; forming a first insulating layer over one of a surface of the single crystal semiconductor substrate and a surface of a base substrate; bonding the single crystal semiconductor substrate and the base substrate to each other with the first insulating layer interposed therebetween so as to form a space in which the single crystal semiconductor substrate and the base substrate are not bonded to each other; and separating the single crystal semiconductor substrate from the base substrate at the embrittled region by heat treatment, leaving a single crystal semiconductor layer between the surface of the single crystal semiconductor substrate and the embrittled region over the base substrate; wherein a stress is generated through the heat treatment, in proximity of the space in the single crystal semiconductor substrate in order that separation of the single crystal semiconductor substrate is promoted.