Patent ID: 7582160

Claim:
A process for producing a silicon single crystal by the Czochralski method using a quartz crucible, comprising: estimating an oxygen concentration O p (Ω,T,β) in the silicon single crystal during growth, wherein Ω represents a crucible rotation rate, T represents a crucible temperature, and β represents a contact area ratio of molten silicon with an inner wall of crucible and a contact area of molten silicon with an atmospheric gas; estimating the oxygen concentration O p (Ω,T,β) by using the formula O p (Ω,T,β)=A×F(Ω)×1/β×Exp(−E/T)+B, wherein A and B represent constants, F represents a function of the crucible rotation rate Ω and E represents the dissolution energy of quartz into silicon and controlling at least one of the crucible rotation rate (Ω) and the crucible temperature (T) to satisfy the formula |O p (Ω,T,β)−O t (β)|≦Δ, wherein O t is a target oxygen concentration in the single crystal and Δ is an acceptable variation of the oxygen concentration in the growing part of the single crystal.