Patent ID: 9735045
Date: 2017-08-15
CPC Classifications: H01L

Claim:
1. A method of manufacturing a bonded wafer, comprising: implanting at least one gas ion selected from a hydrogen ion and a rare gas ion into a bond wafer from a surface of the bond wafer to form a layer of the implanted ion; bonding the surface from which the ion is implanted into the bond wafer and a surface of a base wafer directly or through an insulator film; subsequently separating the bond wafer along the layer of the implanted ion to form a bonded wafer having a thin film on the base wafer; performing rapid thermal annealing (RTA) under an atmosphere containing hydrogen on the bonded wafer after separating the bond wafer; and subsequently performing a sacrificial oxidation process to reduce a thickness of the thin film, wherein the RTA is performed under conditions of a retention start temperature of more than 1150° C. and a retention end temperature of 1150° C. or less, and a temperature fall occurs without a temperature rise during a retention period of transition between the retention start temperature and the retention end temperature.