Patent ID: 9076839
Filing Date: 2015-07-07
Classification: H01L

Abstract:
1. A method for manufacturing an SOI substrate comprising the steps of: irradiating a single crystal semiconductor substrate with ions to form an embrittlement region in the single crystal semiconductor substrate; bonding the single crystal semiconductor substrate and a base substrate with an insulating layer interposed therebetween; separating the single crystal semiconductor substrate at the embrittlement region to form a single crystal semiconductor layer over the base substrate with the insulating layer interposed therebetween; and irradiating the single crystal semiconductor layer with a laser beam under a reducing atmosphere including at least hydrogen gas to melt at least a surface portion of the single crystal semiconductor layer to recrystallize the single crystal semiconductor layer, wherein an oxygen concentration in the single crystal semiconductor layer after the irradiation with the laser beam is less than 1×10