Patent ID: 7790572
Filing Date: 2010-09-07
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor substrate comprising: producing ion species by exciting a source gas including one or plural gases selected from a hydrogen gas, a rare gas, a halogen gas, or a halide compound gas and introducing the ion species into a first single crystal semiconductor substrate to form an embrittlement layer; forming a bonding layer over the first single crystal semiconductor substrate; bonding the first single crystal semiconductor substrate and a base substrate with the bonding layer interposed therebetween so that the first single crystal semiconductor substrate and the base substrate are attached to each other; separating the first single crystal semiconductor substrate by using the embrittlement layer as a cleavage plane by heating the first single crystal semiconductor substrate so that a single crystal semiconductor layer separated from the first single crystal semiconductor substrate is fixed over the base substrate; and reprocessing a second single crystal semiconductor substrate from which the single crystal semiconductor layer has been separated, wherein the step of reprocessing is conducted in such a manner that the second single crystal semiconductor substrate is irradiated with a laser light from a surface side of the second single crystal semiconductor substrate from which the single crystal semiconductor layer has been separated, to melt the second single crystal semiconductor substrate, and wherein a melting time per area is from 0.5 microseconds to 1 millisecond.