Patent ID: 7713838

Claim:
A manufacturing method of an SOI wafer, comprising: preparing a supporting wafer comprising boron in an amount of 9×10 18 atoms/cm 3 or more; forming an insulating film having a thickness of 0.1-0.5 μm on at least a surface opposite to a bonding surface of said supporting wafer; ion-implanting hydrogen gas or a noble gas element to an active layer wafer to thereby form an ion-implanted layer in said active layer wafer; bonding said active layer wafer with the other surface of said supporting wafer via an insulating film interposed therebetween to thereby form a bonded wafer; and then heat treating said bonded wafer to thereby induce cleavage in a portion of said bonded wafer at the site of the ion-implanted layer as an interface to thereby form an SOI layer with said remaining active layer wafer for manufacturing said SOI wafer, wherein a thickness of the SOI layer is less than 0.10 μm.