Patent ID: 9337013
Filing Date: 2016-05-10
CPC Classification: C30B,H01L

Claim Text:
1. A method for producing a silicon wafer from a defect-free silicon single crystal grown by a Czochralski (CZ) method, the method comprising: preparing the silicon wafer obtained by slicing the defect-free silicon single crystal and subjected to mirror-polishing; then performing a heat treatment step of subjecting the mirror-polished silicon wafer to heat treatment at a temperature of 500° C. or higher but 600° C. or lower for 4 hours or more but 6 hours or less; and performing a repolishing step of repolishing the silicon wafer after the heat treatment step such that a polishing amount becomes 1.5 μm or more, wherein by performing the heat treatment step and the repolishing step, the silicon wafer in which the number of Light Point Defects (LPDs) that are 37 nm or more but 120 nm or less in particle diameter size, the LPDs detected by a particle counter, is 10/wafer or less is produced.