Patent ID: 7829436

Claim:
A process for regeneration of a layer transferred wafer, in which a main surface of a semiconductor wafer has a main flat portion and a chamfered portion formed on the periphery of said main flat portion, an ion implanted area is formed inside said semiconductor wafer by implanting ions only into said main surface of said semiconductor wafer, a laminated body is formed by laminating said main flat portion of said semiconductor wafer on a main surface of a support wafer, and said semiconductor wafer is separated from a thin layer in said ion implanted area by heat treatment of said laminated body so as to obtain a thick layer transferred wafer, wherein a ring-shape step is formed protruding from said chamfered portion in the main flat portion of said semiconductor wafer, and said semiconductor wafer is separated from the thin layer on the whole surface of said ion implanted area so that no step is generated in the periphery to obtain the layer transferred wafer.