Patent ID: 7329317
Filing Date: 2008-02-12
Classification: C30B

Abstract:
1. 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 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