Patent ID: 7767549

Claim:
A method of manufacturing a bonded wafer comprising: forming an oxide film on at least one surface of a base wafer through oxidation, bonding the base wafer on which the oxide film has been formed to a top wafer to form a bonded wafer, and thinning the top wafer included in the bonded wafer, wherein the oxidation comprises heating the base wafer to a heating temperature ranging from 800 to 1300° C. at a rate of temperature increase ranging from 1 to 300° C./second in an oxidizing atmosphere, and holding the base wafer for 1 to 3 minutes at the heating temperature and then lowering a temperature at a rate of temperature reduction ranging from 50 to 100° C./second and wherein the bonding is carried out so as to position the oxide film formed in the oxidation at an interface of the top wafer and the base wafer.