Metrology for block copolymer directed self-assembly structures using Mueller matrixbased scatterometry

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Authors
Dixit, Dhairya J.
Kamineni, Vimal
Farrell, Richard
Hosler, Erik R.
Preil, Moshe
Race, Joseph
Peterson, Brennan
Diebold, Alain C.
Issue Date
2015
Type
Article
Language
en_US
Keywords
patterning , directed self-assembly , nano manufacturing , Mueller matrix spectroscopic ellipsometry , scatterometry , anisotropy , depolarization calculation
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Alternative Title
Journal of Micro/Nanolithography, MEMS, and MOEMS
Abstract
Patterning based on directed self-assembly (DSA) of block copolymer (BCP) has been demonstrated to be a cost-effective manufacturing technique for advanced sub-20-nm structures. This paper describes the application of Mueller matrix spectroscopic ellipsometry (MMSE) based scatterometry to optically characterize polystyrene-b-polymethylmethacrylate patterns and Si fins fabricated with DSA. A regression-based (inverse problem) approach is used to calculate the line-width, line-shape, sidewall-angle, and thickness of the DSA structures. In addition, anisotropy and depolarization calculations are used to determine the sensitivity of MMSE to DSA pattern defectivity. As pattern order decreases, the mean squared error value increases, depolarization value increases, and anisotropy value decreases. These specific trends are used in the current work as a method to judge the degree of alignment of the DSA patterns across the wafer.
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Citation
Dixit, D. J., Kamineni, V., Farrell, R., Hosler, E. R., Preil, M., Race, J., … Diebold, A. C. (2015). Metrology for block copolymer directed self-assembly structures using Mueller matrixbased scatterometry. Journal of Micro/Nanolithography, MEMS, and MOEMS, 14(2), 021102. doi:10.1117/1.JMM.14.2.021102
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Journal of Micro/Nanolithography, MEMS, and MOEMS
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ISSN
1932-5150
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