Patent ID: 8466043

Claim:
An internal gettering process for a Cz silicon wafer, comprising: a rapid thermal processing treatment, comprising: heating a Cz silicon wafer to a temperature in a range from 1200° C. to 1250° C. at a heating rate between 50° C./second and 100° C./second under a nitrogen atmosphere, maintaining the Cz silicon wafer at the temperature for a period of 30 seconds to 150 seconds, cooling the Cz silicon wafer to a temperature in a range from 800° C. to 1000° C. at a cooling rate between 5° C./second and 50° C./second, and cooling the Cz silicon wafer naturally; and annealing the Cz silicon wafer obtained in the rapid thermal processing treatment at a temperature in a range from 800° C. to 900° C. under an argon atmosphere for a period of 8 hours to 16 hours.