Patent ID: 7329317

Claim:
A method for producing a silicon wafer, comprising: a silicon crystal production step of producing a silicon crystal while controlling a concentration of boron in the silicon crystal and a growth condition V/G (where V is a growth rate, and G is a temperature gradient in a crystal axis direction) by using, as boundary condition, a prescribed relationship between the boron concentration in the silicon crystal and the growth condition V/G (where V is the growth rate, and G is the temperature gradient in the crystal axis direction), which is shown by a lower limit line (LN 1 ) of an epitaxial defect-free region (α 2 ), so as to fall within the epitaxial defect-free region (α 2 ) which is a defect-free region in which a silicon wafer substrate is free of defects and an epitaxial growth layer is free of defects and which has the lower limit line (LN 1 ) in which, at the boron concentrations in the silicon crystal of 1×10 18 atoms/cm 3 and above, the growth rate V gradually decreases as the boron concentration rises, and so as not to fall within an epitaxial defect region (β 2 ) in which a dislocation loop cluster occurs in the silicon wafer substrate and defects occur in the epitaxial growth layer and in which the lower limit line (LN 1 ) is an upper limit line; a silicon wafer substrate obtaining step of obtaining the silicon wafer substrate from the silicon crystal; and an epitaxial growth step of forming the epitaxial growth layer on the silicon wafer substrate, wherein in the silicon crystal production step, controlling the oxygen concentration in the silicon crystal to no more than 12.5×10 17 atoms/cm 3 .