Patent ID: 7851318
Filing Date: 2010-12-14
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor substrate comprising: irradiating a single crystal semiconductor substrate with accelerated ions, to form a damaged region in the single crystal semiconductor substrate 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 close contact with each other with the buffer layer interposed therebetween to fix the single crystal semiconductor substrate to the supporting substrate; causing a crack in the damaged region by heating of the single crystal semiconductor substrate and separating the single crystal semiconductor substrate from the supporting substrate at the damaged region to form a single crystal semiconductor layer separated from the single crystal semiconductor substrate; irradiating the single crystal semiconductor layer with a laser beam to melt the single crystal semiconductor layer for recrystallizing the single crystal semiconductor layer; and heating the recrystallized single crystal semiconductor layer at a temperature which is higher than or equal to 400° C. and at which the recrystallized single crystal semiconductor layer is not melted.