Patent ID: 8574363

Claim:
A producing method of a silicon monocrystal, comprising: adding phosphorus (P) and germanium (Ge) into a silicon melt or adding phosphorus into a silicon/germanium melt; and growing a silicon monocrystal from the silicon melt by a Czochralski method, wherein: a phosphorus concentration [P] L (atoms/cm 3 ) in the silicon melt, a Ge concentration [Ge] (atoms/cm 3 ) in the silicon monocrystal, an average temperature gradient G ave (K/mm) and a pull speed V (mm/min) are controlled to satisfy a formula (1) as follows, a phosphorus concentration [P] (atoms/cm 3 ) in the silicon monocrystal is 4.84×10 19 atoms/cm 3 or more and 8.49×10 19 atoms/cm 3 or less, and the phosphorus concentration [P] (atoms/cm 3 ) and the Ge concentration [Ge] (atoms/cm 3 ) in the silicon monocrystal satisfy a relationship according to a formula (2) as follows while growing the silicon monocrystal [P] L +(0.3151×[Ge]+3.806×10 18 )/1.5<0.5×(G ave /V+43)×10 19 (1) [Ge]←6.95×[P]+5.90×10 20 (2).