Patent ID: 8772128

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: irradiating a single crystal semiconductor substrate with ions that are accelerated with an ion doping apparatus to form a damaged region in a region at a predetermined depth from a surface of the single crystal semiconductor substrate; forming a buffer layer over at least one of a supporting substrate and the single crystal semiconductor substrate; disposing the supporting substrate and the single crystal semiconductor substrate in contact with each other with the buffer layer interposed between the supporting substrate and the single crystal semiconductor substrate to bond the supporting substrate and the single crystal semiconductor substrate to each other; causing a crack in the damaged region by heating the single crystal semiconductor substrate to separate the single crystal semiconductor substrate from the supporting substrate, thereby forming a supporting substrate to which a single crystal semiconductor layer that is separated from the single crystal semiconductor substrate is fixed; and irradiating the single crystal semiconductor layer fixed to the supporting substrate with a laser beam while heating the single crystal semiconductor layer by a heated gas, to melt the single crystal semiconductor layer, thereby performing re-single-crystallization of the single crystal semiconductor layer.