Patent ID: 7846253
Filing Date: 2010-12-07
Classification: C30B

Abstract:
1. A method for producing an epitaxial wafer wherein the epitaxial wafer includes an epitaxial film on a silicon wafer and a defect density to be found on the surface of the epitaxial wafer is not higher than 10 counts per substrate (wf), the silicon wafer being sliced from a silicon single crystal, the silicon single crystal being grown while boron ranging from 1×10 17 to 1×10 19 atoms/cm 3 and carbon ranging from 1×10 15 to 2×10 16 atoms/cm 3 (ASTM F123-1981) are doped on a condition that a ring-shaped oxygen induced stacking fault region emerges in a crystal surface over a whole length of a straight body portion of a pulled silicon single crystal by the Czochralski method.