Patent ID: 6669775
Filing Date: 2003-12-30
Classification: C30B

Abstract:
A method for producing a silicon wafer which retains high-resistivity throughout a device fabrication heat treatment, comprising:growing a silicon single crystal ingot having a resistivity of 100 &OHgr;Â·cm or greater and an initial interstitial oxygen concentration of about 10 to about 40 ppma by the Czochralski method with a ratio of pull rate (v) to axial temperature gradient (G) at the molten silicon solid silicon interface of about 1Ã—10âˆ’5 cm2/sÂ·K to about 5Ã—10âˆ’5 cm2/sÂ·K, processing the silicon single crystal ingot into a high-resistivity wafer, and subjecting the high-resistivity wafer to an oxygen precipitation heat treatment causing the residual interstitial oxygen concentration of the wafer to become 8 ppma or less.