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Proceedings Paper

Contributions to EUV mask metrology infrastructure
Author(s): Azadeh Farahzadi; Rainer Lebert; Markus Benk; Larissa Juschkin; Stefan Herbert; Aleksey Maryasov
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Paper Abstract

There is a strong demand for stand alone actinic tools for high volume manufacturing of EUV mask infrastructure. Among such metrology tools reflectometry, blank inspection, mask defect and pattern inspection are of special need to be in pilot lines of EUVL roadmaps expected to prepare production in 2012 to 213. With existing lab sources and metrology tool technology we expect to make significant contributions. With the existing EUV-reflectometer developed for mask blank characterization accuracies of < 0.1 % in peak reflectivity precision and 0.002 nm for centroid wavelength (CWL_50. 1 σ) are routinely achieved on both reflective multilayer coated and absorbers coated blanks. Furthermore, new upgrades for fiducial mark detection in the reflectometer allow for measurements on structured masks with precise positioning (better than 50 μm). Meanwhile, detail studies on reproducibility and sensibility of measurement versus tilt angle have been performed. These studies shows less than 1% change in peak reflectometry due to 500 μrad tilt, while accuracy of alignment is <100 μrad. We will demonstrate our recent achievements and further plans to along the roadmap requirements. Actinic mask blank defect inspection is considered crucial and is required at mask blank suppliers and perhaps in mask houses. For this aim, a proof of concept experiment based on an EUV microscope has been set up. The first results are presented together with tool extrapolation. We analyze the achievable defect resolving power and its localization with limited performance state-of-the-art collecting objectives. Possible alternative approaches are discussed.

Paper Details

Date Published: 15 May 2010
PDF: 5 pages
Proc. SPIE 7545, 26th European Mask and Lithography Conference, 754505 (15 May 2010); doi: 10.1117/12.865750
Show Author Affiliations
Azadeh Farahzadi, Bruker Advanced Supercon GmbH (Germany)
Rainer Lebert, Bruker Advanced Supercon GmbH (Germany)
Markus Benk, Fraunhofer Institute TOS (Germany)
Larissa Juschkin, RWTH Aachen Univ. (Germany)
Stefan Herbert, RWTH Aachen Univ. (Germany)
Aleksey Maryasov, RWTH Aachen Univ. (Germany)

Published in SPIE Proceedings Vol. 7545:
26th European Mask and Lithography Conference
Uwe F.W. Behringer; Wilhelm Maurer, Editor(s)

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