Patent ID: 8409966

Claim:
A method for manufacturing a semiconductor device comprising: a first step of forming a separation layer in a semiconductor wafer by irradiating the semiconductor wafer with a cluster ion from a first surface side of the semiconductor wafer; a second step of bonding a first surface of the semiconductor wafer and a substrate to each other with an insulating layer interposed therebetween; a third step of separating the semiconductor wafer at the separation layer or at a region near the separation layer to form a separation wafer having a separation plane and a silicon-on-insulator substrate which includes a semiconductor layer formed over the substrate with the insulating layer interposed therebetween; a fourth step of treating the separation wafer having the separation plane; and a fifth step of performing the first to fourth steps using the separation wafer as the semiconductor wafer of the first to third steps, wherein the semiconductor wafer has the first surface side that contains the first surface and a second surface side opposed to the first surface side, and the first to third steps are performed only on the first surface side of the semiconductor wafer, wherein the cluster ion comprises H 3 + ions, wherein the H 3 + ions are contained at least 80% in a total amount of all kinds of ions generated from a source gas containing hydrogen, and wherein the H 3 + ions are generated by thermoelectrons discharged from a filamentary electrode.