Patent ID: 7691724

Claim:
A method for manufacturing an SOI substrate comprising: a step A of implanting hydrogen ions from a main surface of a single-crystal silicon substrate having an interstitial oxygen concentration which is equal to or below 1×10 18 cm −3 ; a step B of performing an activation treatment with respect to the main surface of at least one of a transparent insulative substrate and the silicon substrate; a step C of bonding the main surface of the transparent insulative substrate to the main surface of the silicon substrate at a room temperature; a step D of performing a heat treatment with respect to the bonded substrate at a temperature falling within the range of 350° C. to 550° C. wherein a cooling rate after the heat treatment of the step D is equal to or below 5° C./minute; and a step E of mechanically delaminating a silicon thin film from the silicon substrate to form a silicon film on the main surface of the transparent insulative substrate.