Patent ID: 6914442

Claim:
A method for measuring resistivity of a semiconductor wafer by the use of a surface photo voltage method, comprising the steps of: (a) measuring a surface photo voltage value in both regions of a low frequency region in which a constant surface photo voltage value is obtained irrespective of a frequency of incident light on a semiconductor wafer to be measured and a high frequency region in which the surface photo voltage value inversely proportional to the frequency of the incident light is obtained and calculating a cut-off frequency f c from the obtained measured value; (b) calculating a depletion layer width W d from capacitance C dp calculated from the surface photo voltage value in the high frequency region; (c) calculating majority carrier conductance g mj from the cut-off frequency f c and the capacitance C dp ; and (d) calculating surface potential U S and Fermi potential U F from the cut-off frequency f c , the capacitance C dp , the depletion layer width W d , and the majority carrier conductance g mj .