Patent ID: 6875633

Claim:
A method for manufacturing an integrated circuit comprising the steps of: forming an insulating film on one surface of a single-crystal semiconductor substrate; patterning said insulating film, thereby selectively forming a mask; converting a portion of said single-crystal semiconductor substrate into at least one porous layer by using an anodizing treatment; removing said mask; forming a first silicon oxide layer on said one surface; polishing a surface of said first silicon oxide layer; adding hydrogen into said single-crystal semiconductor substrate and said porous layer through said first silicon oxide layer, thereby forming a hydrogen-added layer; adhering together said single-crystal semiconductor substrate and a supporting substrate provided with a second silicon oxide layer thereon; performing a first heat treatment, thereby separating said single-crystal semiconductor substrate and said porous layer along said hydrogen-added layer; performing a second heat treatment of said supporting substrate at 900-1200° C.; and removing said porous layer present over said supporting substrate.