Patent ID: 8263484

Claim:
A method for manufacturing a high resistivity silicon wafer where a depth range of a p/n type conversion occurrence region from a wafer surface can be adjusted, the method comprising: pulling a single crystal such that the single crystal has a p-type dopant concentration at which a wafer surface resistivity becomes in a range of 0.1 to 10 k Ωcm, an oxygen concentration Oi of 5.0×10 17 to 20×10 17 atoms/cm 3 (ASTM F-121, 1979), and a nitrogen concentration of 1.0×10 13 to 10×10 13 atoms/cm 3 (ASTM F-121, 1979) by using a Czochralski method; processing the single crystal into wafers by slicing the single crystal; and subjecting the wafer to an oxygen out-diffusion heat treatment process in a non-oxidizing atmosphere, wherein a peak position of a resistivity serving as a boundary between a p-type region of a wafer surface side and a p/n conversion region of an inner side of a thickness direction is adjusted by the nitrogen concentration such that the peak position is set to a boundary depth in a range of 10 to 70 μm from the wafer surface.