Patent ID: 11965730
Assignee: UNITY SEMICONDUCTOR
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 1:
2. The method for measuring a film thickness distribution of a wafer with thin films according to claim 1, wherein the step of determining the wavelength λ1 comprises the steps of:
calculating a profile P1 by a simulation, the profile P1 indicating a wavelength dependence of a reflectance of the wafer with thin films with respect to light of a wavelength region not less than a wavelength of visible light;
calculating a profile P22 by a simulation, the profile P22 indicating a wavelength dependence of a reflectance of a reference wafer with thin films which includes a first thin film that is t thinner or thicker than a set film thickness T1 of the first thin film of the wafer with thin films with respect to the light of the wavelength region not less than the wavelength of visible light;
calculating a profile P32 (=P22−P1) of a difference between the calculated profiles P1 and P22 and determining as λ1 a wavelength observed when the calculated profile P32 of the difference becomes 0.