Patent ID: 7621996

Claim:
A method for producing a silicon wafer having a carbon concentration of 5×10 15 to 5×10 17 atoms/cm 3 , an interstitial oxygen concentration of 6.5×10 17 to 13.5×10 17 atoms/cm 3 , and a resistivity of 100 Ωcm or more, comprising: performing the crystal growth of a silicon single crystal by the CZ method such that the silicon single crystal has a resistivity of 100 Ωcm or more, a primary interstitial oxygen concentration of 8.0×10 17 to 16.0×10 17 atoms/cm 3 , and a carbon concentration of 5×10 15 to 5×10 17 atoms/cm 3 ; and performing a first heat treatment where a silicon wafer sliced from the silicon single crystal is heated in an atmosphere composed of argon, nitrogen, or a mixed gas of argon and nitrogen, and the heating temperature of the wafer is increased from 700° C. to 1000° C. with a heating rate of 1 to 2° C./min.