Patent ID: 6680260
Filing Date: 2004-01-20
Classification: H01L

Abstract:
A method of producing a bonded SOI wafer comprising bonding a bond wafer and a base wafer via an oxide film and then reducing thickness of the bond wafer, wherein a silicon single crystal ingot is grown according to Czochralski method, the single crystal ingot is then sliced to produce a silicon single crystal wafer, the silicon single crystal wafer is subjected to heat treatment in a non-oxidizing atmosphere at a temperature of 1100Â° C. to 1300Â° C. for one minute or more and continuously to a heat treatment in an oxidizing atmosphere at a temperature of 700Â° C. to 1300Â° C. for one minute or more without cooling the wafer to a temperature less than 700Â° C. to provide a silicon single crystal wafer wherein a silicon oxide film is formed on the surface, and the resultant wafer is used as the bond wafer.