Patent ID: 6384415
Filing Date: 2002-05-07
Classification: G01N

Abstract:
A method of evaluating the quality of a silicon wafer comprising analyzing a silicon wafer by an infrared absorption spectrum, and then evaluating the quality of the silicon crystal based on an absorbance ratio represented by the following formula (1):{(Absorbance &agr;1 at an arbitrary wavenumber between 1055 and 1080 cmâˆ’1)âˆ’(Absorbance &agr;BL of base line)}/{(Absorbance &agr;2 at an arbitrary wavenumber between 1100 and 1120 cmâˆ’1)âˆ’(Absorbance &agr;BL of base line)}â€ƒâ€ƒ(1) wherein absorbances &agr;1 and &agr;2 represent absorbances of the measured silicon wafer, and base line absorbance &agr;BL represents the absorbance of a base line of the measured silicon wafer, which is drawn from 1030 to 1170 cmâˆ’1.