Patent ID: 7838388

Claim:
A method for producing an SOI substrate having a thick-film SOI layer, wherein, at least, an ion-implanted layer is formed by implanting at least one kind of ion of hydrogen ion and a rare gas ion into a surface of a bond wafer, an SOI substrate having an SOI layer is produced by, after the ion-implanted surface of the bond wafer and a surface of a base wafer are bonded together via an oxide film, delaminating the bond wafer along the ion-implanted layer, and a thick-film SOI layer is formed by performing a heat treatment on the SOI substrate having the SOI layer in a reducing atmosphere containing hydrogen or an atmosphere containing hydrogen chloride gas, after performing the heat treatment, polishing a surface of the SOI layer by CMP, and after the polishing, growing a silicon epitaxial layer on the SOI layer of the SOI substrate.