Patent ID: 6271101
Filing Date: 2001-08-07
Classification: H01L,Y10S

Abstract:
A process for producing an SOI substrate 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;adding hydrogen into said single-crystal silicon 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.degree. C.; andremoving said porous layer present over said supporting substrate.