Patent ID: 7875115

Claim:
A method for production of an epitaxial wafer, the method comprising the steps of: growing a silicon single crystal by the Czochralski method with a nitrogen dopant and using a V/G between an upper limit of 1.4 exp(6.2×10 −16 ×nitrogen concentration)×(V/G)crit and a lower limit of 1.0 exp(−7.1×10 −16 ×nitrogen concentration)×(V/G)crit, wherein V denotes the pulling speed, G denotes the average temperature gradient from the melting point to 1350° C. in the direction of the crystal growth axis and (V/G)crit denotes the V/G value for a silicon single crystal without nitrogen dopant that is contiguous to the boundary of V-region and I-region, and using a cooling rate of at least about 4° C./minute between 1100 and 1000° C., and subjecting the growing silicon single crystal to simultaneous doping of nitrogen and carbon at a nitrogen concentration of 5×10 14 to 5×10 15 atoms/cm 3 and a carbon concentration of 1×10 16 to 1×10 18 atoms/cm 3 ; cutting a substrate from the silicon single crystal; and depositing an epitaxial layer on a surface of the substrate.