Patent ID: 7829434

Claim:
A method for manufacturing a semiconductor wafer comprising the steps of: forming a bond layer over a surface of a first semiconductor wafer; forming a separation layer below the bond layer by irradiating the first semiconductor wafer with hydrogen ions including H 3 + ions by an ion doping apparatus comprising an ion source including a filament for emitting thermo electrons and a plurality of magnet rings arranged around the chamber; bonding the bond layer of the first semiconductor wafer to one surface of a second semiconductor wafer; and separating a part of the first semiconductor wafer along a cleavage plane which is inside the separation layer or which is an interface of the separation layer by performing heat treatment; wherein the ratio of H 3 + in the hydrogen ions is 80% or more, and wherein the second semiconductor wafer includes the bond layer over the surface of the second semiconductor wafer and a single crystal semiconductor layer over the bond layer.