Patent ID: 7521381
Filing Date: 2009-04-21
Classification: H01L

Abstract:
1. A silicon wafer, comprising: vacancies formed therein by a thermal annealing at a temperature of 900° C. to 1180° C. in an atmosphere including a nitride gas having a lower decomposition temperature than a decomposable temperature of N a silicon nitride-oxide film on a surface thereof which is formed by nitriding the surface during the thermal annealing, the silicon nitride-oxide film containing hydrogen; a non-defect layer which is formed by annihilation of vacancies and interstitial silicon as at least a surface layer of the silicon wafer; and oxygen precipitated by utilizing the vacancies, wherein the BMD density in the silicon wafer is in a range from 6×10 a slip length is 0.4 mm or less, and the slip length is a value of the maximum interval among dislocation pits measured after 13 μm is etched off by non-agitated Secco etching.