Patent ID: 7897476

Claim:
A method of manufacturing an SOI substrate, comprising the steps of: forming an ion introduced layer in a semiconductor substrate; forming a silicon oxide film on the semiconductor substrate by chemical vapor deposition using organic silane as a silicon source gas; bonding the semiconductor substrate to a base substrate with the silicon oxide film interposed therebetween; heating the semiconductor substrate to separate a part of the semiconductor substrate at the ion introduced layer, thereby, forming a semiconductor layer on the base substrate; and irradiating the semiconductor layer with a laser beam having an energy density within the range of from 300 to 750 mJ/cm 2 so that the semiconductor layer is melted at least partly, wherein the ion introduced layer is formed by using a halogen gas as a source gas, irradiating the semiconductor substrate with the ions generated from the halogen gas, and then using a hydrogen gas as a source gas, and irradiating the semiconductor substrate with the ions generated from the hydrogen gas.