Patent ID: 7763541

Claim:
A process for regenerating a layer transferred wafer, obtained as a by-product in manufacturing a bonded SOI wafer by an ion implantation separation method so as to be reused for an SOI layer wafer of the bonded SOI wafer, comprising: rapidly heating the layer transferred wafer in an oxidizing atmosphere, then holding it for a fixed time and rapidly cooling it; followed by mirror-polishing a surface of the cooled layer transferred wafer, wherein through rapid heating/rapid cooling the layer transferred wafer is heated from a room temperature to a temperature in the range of 1000 to 1350° C. at a temperature elevating rate of 50 to 5000° C./minute, then the wafer is held at the raised temperature for 1 to 1000 seconds, whereby oxygen precipitate nuclei or oxygen precipitates are dissolved, and subsequently the wafer is cooled from the raised temperature to a room temperature at a temperature rate of 50 to 5000° C./minute, whereby a solid solution is maintained and oxygen precipitate nuclei or oxygen precipitates are eliminated.