Patent ID: 8936999
Filing Date: 2015-01-20
Classification: H01L

Abstract:
1. A method for manufacturing an SOI substrate, comprising the steps of: polishing a first surface of a semiconductor substrate; forming an embrittled region in the semiconductor substrate by irradiating a second surface of the semiconductor substrate which is opposite to the first surface with ions; attaching the semiconductor substrate to a base substrate while the second surface of the semiconductor substrate faces the base substrate; forming a semiconductor layer over the base substrate by separating a part of the semiconductor substrate from the rest of the semiconductor substrate along the embrittled region; and thinning the semiconductor layer by etching, wherein the step of polishing the first surface of the semiconductor substrate is performed by performing chemical mechanical polishing using a first slurry on the first surface of the semiconductor substrate and then performing chemical mechanical polishing using a second slurry on the first surface of the semiconductor substrate, and wherein the step of polishing the first surface of the semiconductor substrate is performed before the step of forming the embrittled region in the semiconductor substrate.