Patent ID: 9606030
Date: 2017-03-28
CPC Classifications: G01N,H01L

Claim:
1. A method for detecting a crystal defect present in a silicon single crystal wafer doped with nitrogen, the silicon single crystal wafer whose initial oxygen concentration is 8 ppma (JEIDA) or lower, the method comprising the steps of: making a crystal defect of defect size of 25 nm or smaller apparent and detectable by implanting oxygen into the crystal defect by performing heat treatment on the silicon single crystal wafer in an atmosphere of oxygen; and detecting the crystal defect of the silicon single crystal wafer after the heat treatment, wherein a heat treatment temperature in the heat treatment is set such that, when a ratio between an oxygen solid solubility and an initial oxygen concentration of the silicon single crystal wafer at a time of heat treatment is set at α=the oxygen solid solubility/the initial oxygen concentration, a falls within a range from 1 to 3.