Patent ID: 7819972

Claim:
A method for growing a silicon single crystal having a body portion composed of an oxide precipitation inhibiting region and having an oxygen concentration of 12×10 17 to 18×10 17 atoms/cm 3 on ASTM-F121 1979 by the Czochralski method, comprising: using a gas containing a gaseous substance containing hydrogen atoms as an atmospheric gas used for growing the single crystal; controlling a temperature of the silicon single crystal during its growth such that a ratio Gc/Ge of an axial thermal gradient Gc at the central portion of the crystal between a melting point thereof and 1350° C. to an axial thermal gradient Ge at the periphery of the crystal between the melting point thereof and 1350° C. is 1.1 to 1.4, and the axial thermal gradient Gc at the central portion of the crystal is 3.0 to 3.5° C./mm; setting a hydrogen molecule partial pressure of the gaseous substance containing hydrogen atoms in the atmospheric gas at 160 to 400 Pa; determining a relationship between V/G ratios and hydrogen concentrations of individual regions of an infrared scattering defect developing region, an OSF developing region, an oxide precipitation promoting region, an oxide precipitation inhibiting region, and a dislocation cluster developing region, thereby determining the allowable range of hydrogen concentration and a pulling rate for growing a silicon single crystal whose body portion is composed of an oxide precipitation inhibiting region; and setting a pulling rate within the determined allowable range.