Patent ID: 8338277
Filing Date: 2012-12-25
Classification: H01L

Abstract:
1. A method for manufacturing an SOI substrate comprising at least: an oxygen ion implantation step of ion-implanting oxygen ions from one main surface of a single-crystal silicon substrate to form an oxygen ion implanted layer; and a heat treatment step of performing a heat treatment with respect to the single-crystal silicon substrate having the oxygen ion implanted layer formed therein to change the oxygen ion implanted layer into a buried oxide film layer, wherein acceleration energy for the oxygen ion implantation is previously determined from a thickness of the buried oxide film layer to be obtained, the thickness being 80 nm or below; the oxygen ion implantation step is carried out with the determined acceleration energy to manufacture the SOI substrate; the oxygen ion implantation step is carried out with the acceleration energy with which a thickness t a dose amount of the oxygen ion implantation is 3.5×10 the acceleration energy is 110 keV or below.