Patent ID: 8486772

Claim:
A method of manufacturing an SOI substrate, comprising: a first step of subjecting a bond substrate to a first heat treatment in an argon atmosphere and then a second heat treatment in an atmosphere of a mixture of oxygen and nitrogen; a second step of forming an embrittlement region in the bond substrate by irradiating the bond substrate with ions; a third step of bonding the bond substrate to a base substrate with an insulating layer therebetween; a fourth step of splitting the bond substrate at the embrittlement region to form a semiconductor layer over the base substrate with the insulating layer therebetween; a fifth step of repeating the steps from the second step to the fourth step n times after the first step is performed once, wherein n is a natural number greater than or equal to 2; and a sixth step of subjecting the bond substrate to a third heat treatment in an argon atmosphere and then a fourth heat treatment in an atmosphere of a mixture of oxygen and nitrogen after the fifth step, wherein the insulating layer comprises a metal element.