Patent ID: 8573969

Claim:
A method for heat treating a silicon wafer containing a predetermined amount of solid solution oxygen, comprising the steps of: determining a shear stress generated in a heat treatment process from a size, a shape, and a way of holding during treatment of the silicon wafer; determining a strength against a slip determined from a residual solid solution oxygen and an amount and a shape of precipitated oxygen, the strength being given by τ=τ 1 +τ 2 =2.2 ×10 −13 ·Co ·exp(0.215 eV/kT)+μ· b · ( N ·D ·cos(54.7°)) 1/2 (K) where Co is a solid solution oxygen concentration (atoms/cm 3 ; JEITA), k is the Boltzmann constant, T is a temperature in the absolute temperature (K), b is a magnitude of the Burgers vector in the silicon crystal, and μ is a modulus of rigidity of the silicon crystal, N is a density of the oxygen precipitates, and D is a diameter of the oxygen precipitate; determining a heat treatment condition that effectively suppresses slip by comparing the shear stress with the strength; and performing the heat treatment, by heat treatment furnace, under the condition.