Patent ID: 7494899
Filing Date: 2009-02-24
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor substrate, the method comprising: ion-implanting a light element to a predetermined depth position in a single-crystal wafer of which a surface is a cleavage plane; and heat-treating the single-crystal wafer so as to form light-element bubbles along a cleavage plane parallel to the surface of the single-crystal wafer within an ion-implanted region and thereby splitting off a portion of the single-crystal wafer on an ion-implanted side, wherein the heat treatment is a one-directional heat treatment in which the light-element bubbles successively form parallel to the surface of the single-crystal wafer, in order, from one end of the single-crystal wafer, a heated region within the single-crystal wafer is made to travel locally parallel to the wafer surface, and the heat treatment is carried out parallel to the wafer surface and successively from one end of the wafer, the single-crystal wafer is heat-treated using a heat treatment furnace, a heat source is arranged as linear strips at an interior of the heat treatment furnace, and a temperature gradient is provided within the heat treatment furnace, and the single-crystal wafer is a (111) wafer composed of single-crystal silicon.