Patent ID: 9378999
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. In a method for manufacturing SOI wafer comprising forming an oxide film on a bond wafer consisting of a semiconductor single crystal substrate, forming an ion implanted layer into the bond wafer by implanting ions of at least one gas selected from hydrogen and rare gases through the oxide film, bonding together an ion implanted front surface of the bond wafer and a base wafer front surface via the oxide film, thereafter delaminating the bond wafer along the ion implanted layer, and thereby fabricating an SOI wafer, wherein before bonding, the oxide film to be formed on the bond wafer is made such that the oxide film on a back surface is made thicker than the oxide film on a bonded face, and after implanting ions into the bond wafer which has the thicker film on the back surface, the bond wafer and the base wafer are bonded.