Patent ID: 8420503
Filing Date: 2013-04-16
Classification: H01L

Abstract:
1. A method for manufacturing an SOI substrate, the substrate comprising at least a transparent insulating substrate and a silicon film formed on a first main surface of the transparent insulating substrate, while a second main surface of the transparent insulating substrate, an opposite to the first main surface, being roughened, the method comprising at least the steps of: roughening the first main surface with an RMS surface roughness lower than 0.7 nm and the second main surface with an RMS surface roughness higher than the surface roughness of the first main surface to prepare the transparent insulating substrate; forming the silicon film on the first main surface of the transparent insulating substrate, wherein the transparent insulating substrate is a glass substrate, and the step of roughening comprises at least sandblasting the first and the second main surfaces of the glass substrate, and cleaning the sandblasted surfaces of the glass substrate, and the cleaning comprises alkali cleaning after HF cleaning on the sandblasted surfaces.