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Proceedings Paper

Parameter sensitive patterns for scatterometry monitoring
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Paper Abstract

This paper proposes a new highly sensitive scatterometry based Probe-Pattern Grating Focus Monitor. The high sensitivity is achieved by placing transparent lines spaced at the strong focus spillover distance of around 0.6λ/NA from the centerline of a 90 degree phase-shifted probe line that functions as an interferometer detector. The monitor translates the focus error into the probe line trench depth, which can be measured by scatterometry techniques. Simulations of optical imaging, resist development and Optical Digital Profilometry measurements are used to evaluate the expected practical performance. A linear model is developed to estimate focus error based on the measured probe trench depth. The results indicate that the ODP measurement from a single wafer focus setting can detect both the defocus direction and the defocus distance to well under 0.1 Rayleigh unit of defocus.

Paper Details

Date Published: 1 November 2007
PDF: 10 pages
Proc. SPIE 6730, Photomask Technology 2007, 67304S (1 November 2007); doi: 10.1117/12.746833
Show Author Affiliations
Jing Xue, Univ. of California, Berkeley (United States)
Yu Ben, Univ. of California, Berkeley (United States)
Chaohao Wang, Univ. of California, Berkeley (United States)
Marshal Miller, Univ. of California, Berkeley (United States)
Costas J. Spanos, Univ. of California, Berkeley (United States)
Andrew R. Neureuther, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 6730:
Photomask Technology 2007
Robert J. Naber; Hiroichi Kawahira, Editor(s)

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