Patent ID: 8105436
Filing Date: 2012-01-31
Classification: C30B,H01L,Y10T

Abstract:
1. A method of manufacturing a single crystal silicon wafer for use in the production of insulated gate bipolar transistors which is made of single crystal silicon grown by the Czochralski method and has a gate oxide with a film thickness of from 50 to 150 nm, the method comprising the steps of: pulling a silicon single crystal having a density d of COPs with a size at least twice the gate oxide film thickness calculated by formula (3) below t ox (cm) being the gate oxide film thickness and S (cm 2 ) the electrode surface area when evaluating the yield of TZDB pass ratio, and having an interstitial oxygen concentration of at most 7×10 17 atoms/cm 3 while applying a magnetic field to the silicon melt to which dopant for adjusting the resistivity has not been added; then subjecting the pulled silicon single crystal to neutron irradiation so as to dope the crystal with phosphorus.