Patent ID: 9704810
Date: 2017-07-11
CPC Classifications: G03F,H01L

Claim:
1. A method comprising: measuring first scattering properties based on a first radiation detected from a first structure prior to formation of a second structure on the first structure; constructing a first model structure based on the first scattering properties, the first model structure corresponding to the first structure; overlaying the first model structure with an intermediate model structure; calculating a first defect-induced overlay error between the first model structure and the intermediate model structure; measuring second scattering properties based on a second radiation detected from the first and second structures, the second radiation being different from the first radiation; constructing a second model structure based on the second radiation detected from the first and second structures and the first defect-induced overlay error; replacing the intermediate model structure with the second model structure, the second model structure corresponding to the second structure; calculating a second defect-induced overlay error between the first model structure and the second model structure, the first and second model structures being overlaid with respect to each other; correcting an overlay measurement of a target based on the second defect-induced overlay error during production of the target using a lithography apparatus; and adjusting a parameter of the lithography apparatus based on the second defect-induced overlay error to reduce overlay errors during production of a subsequent target using the lithography apparatus.