Patent ID: 8314628

Claim:
An optical measurement method of determining a dopant concentration profile, characterized by a concentration level and a junction depth, of a semiconductor substrate of a semiconductor material, the method comprising: measuring first amplitudes of measured reflection signals obtained by creating different concentrations of excess carriers and impinging a probe laser beam at least partially reflected by the excess carriers on the semiconductor substrate having a dopant profile characterized by a concentration level and a junction depth; determining first correlations between the first amplitudes and the dopant concentration level for a dopant in the substrate; measuring a second amplitude of a reflection signal obtained by creating excess carriers and impinging a probe laser beam at least partially reflected by the excess carriers, on the semiconductor substrate having a dopant profile, characterized by a concentration level and a junction depth; determining second correlations between the first amplitudes and the junction depth of the dopant profile of the semiconductor substrate; and determining from the first and second correlations and the second amplitude the junction depth and the dopant concentration level for the semiconductor substrate.