Patent ID: 11900028
Assignee: NOVA LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for determining simulation parameters for scatterometry analysis for a patterned structure, comprising:
(a) simulating a scatterometry model of the patterned structure to estimate a scattering matrix;
(b) generating returned measurement results data indicative of returned properties of the patterned structure measuring the structure by detection of radiation returned from the patterned structure by at least one of scattering or reflection; wherein the measuring comprises (i) producing light radiation by a light source of a measurement system, (ii) directing the light radiation along an illumination channel to be incident on the patterned structure, (iii) detecting, by a photo detector of the measurement system, the radiation returned from the patterned structure, and (iv) determining by a controller of the measurement system, the returned measurement results data based on signals generated by the photo detector;
(c) computing simulated data based on the scattering matrix and the returned properties of the patterned structure;
(d) determining a fit parameter indicative of a degree of fit between the returned measurement results data and the simulated data;
(e) determining whether the fit parameter satisfies a predetermined fit condition;
(f) when it is determined that the fit parameter does not satisfy the predetermined fit condition, modifying a simulation parameter and performing another iteration of steps (a)-(e); and
(g) when it is determined that the fit parameter does satisfy the predetermined fit condition, storing the scatterometry model in a memory unit.