Patent ID: 7601614

Claim:
A method of manufacturing a silicon on insulator (SOI) substrate, comprising the steps of: forming a buried oxidation layer to a predetermined depth of a first wafer and forming a first oxidation layer on the first wafer such that a portion of the first wafer remains between the buried oxidation layer and the first oxidation layer; carrying out annealing and oxidation processes to form the first oxidation layer on the first wafer so as to make uniform an interface of the buried oxidation layer and remove defects of its rough surface; forming a buried hydrogenated layer in the first wafer to a depth deeper than the buried oxidation layer such that a portion of the first wafer remains between the buried oxidation layer and the buried hydrogenated layer; bonding a second oxidation layer of a second wafer onto the first oxidation layer of the first wafer; removing a portion of the first wafer below the buried hydrogenated layer and the buried hydrogenated layer so as to expose the portion of the first wafer between the buried oxidation layer and the buried hydrogenated layer; sequentially removing the exposed first wafer and the buried oxidation layer so as to expose the portion of the first wafer between the buried oxidation layer and the first oxidation layer; and removing a planar portion of a predetermined thickness of the first wafer exposed in the step of sequentially removing the exposed first wafer.