公开(公告)号：US20250137920A1

公开(公告)日：2025-05-01

申请号：US18919048

申请日：2024-10-17

Applicant: KLA Corporation

Inventor： Amnon Manassen ,  Peter Paquet ,  Yingpin Wu ,  Fang-Jyun Yeh ,  Suryanarayanan Ganesan ,  Jordan Pio ,  Shankar Krishnan ,  Taher Kagalwala ,  Derrick A. Shaughnessy ,  Yan Zhang ,  Stilian Pandev ,  Min-Yeong Moon

IPC: G01N21/21 ,  G01N21/95

Abstract: A metrology system may include a spectroscopic metrology sub-system and a controller, the controller including one or more processors configured to execute program instructions configured to cause the one or more processors to: generate a tool-induced shift (TIS) model of a training sample by the metrology sub-system comprising: receiving training data from metrology measurements of the training sample, the training data comprising spectral data associated with at least one off-diagonal Mueller matrix element generated by one or more first measurements of the training sample at a first azimuthal angle and one or more second measurements of the training sample at a second azimuthal angle, deriving overlay spectra data and TIS spectra data from the training data, decomposing the overlay spectra data and the TIS spectra data, and inferring a TIS signature for the training sample; and to remove the TIS signature from a test sample.