Patent ID: 7663393

Claim:
A method of determining mobility of inversion charge carriers situated at an interface surface between at least one layer of a dielectric material and a top surface of a semiconductor substrate, the method comprising: providing a semiconductor substrate with a top surface whereon at least one layer of a dielectric material is deposited thereby forming an interface surface between the semiconductor substrate and the at least one layer of the dielectric material and a top surface of the at least one dielectric material; applying a charge on a dedicated area of the top surface of the at least one dielectric material; measuring a voltage Vs on the top surface of the at least one dielectric material; illuminating the dedicated area to define an illuminated spot; measuring during the illumination of the area the photovoltage inside and outside the defined illuminated spot; and determining the mobility of the inversion charge carriers, situated at the interface surface and influenced by the at least one dielectric layer, by determination of the sheet resistance from the photovoltage measurement as being inversely proportional to the mobility.