Patent ID: 7050160

Claim:
A process for determining the thickness of a thin film by measuring both the reflectance and sheet resistance of said thin film in the same measurement apparatus comprises: a) mounting a thin film in said chamber; b) mounting in said same measurement apparatus an apparatus capable of measuring the sheet resistance of said thin film; c) mounting a reflectance apparatus in said same measurement apparatus adjacent said sheet resistance measurement apparatus; d) directing a beam of radiation from a radiation source of said reflectance apparatus onto a portion of the surface of said thin film in said measurement apparatus; e) sensing the radiation reflected from said surface of said thin film to measure the reflectance of the surface of said thin film; f) determining the resistivity of said thin film from said measured reflectance of said thin film g) contacting a portion of said surface of said thin film adjacent said portion of said thin film contacted by said radiation beam, to measure the sheet resistance of said thin film in said measurement apparatus; and h) determining the thickness of said thin film from said resistivity and said measured sheet resistance.