18 March 2015 Immersion and dry scanner extensions for sub-10nm production nodes
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Abstract
Progressing towards the 10nm and 7nm imaging node, pattern-placement and layer-to-layer overlay requirements keep on scaling down and drives system improvements in immersion (ArFi) and dry (ArF/KrF) scanners. A series of module enhancements in the NXT platform have been introduced; among others, the scanner is equipped with exposure stages with better dynamics and thermal control. Grid accuracy improvements with respect to calibration, setup, stability, and layout dependency tighten MMO performance and enable mix and match scanner operation. The same platform improvements also benefit focus control. Improvements in detectability and reproducibility of low contrast alignment marks enhance the alignment solution window for 10nm logic processes and beyond. The system’s architecture allows dynamic use of high-order scanner optimization based on advanced actuators of projection lens and scanning stages. This enables a holistic optimization approach for the scanner, the mask, and the patterning process. Productivity scanner design modifications esp. stage speeds and optimization in metrology schemes provide lower layer costs for customers using immersion lithography as well as conventional dry technology. Imaging, overlay, focus, and productivity data is presented, that demonstrates 10nm and 7nm node litho-capability for both (immersion & dry) platforms.
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Stefan Weichselbaum, Stefan Weichselbaum, Frank Bornebroek, Frank Bornebroek, Toine de Kort, Toine de Kort, Richard Droste, Richard Droste, Roelof F de Graaf, Roelof F de Graaf, Rob van Ballegoij, Rob van Ballegoij, Herman Botter, Herman Botter, Matthew G McLaren, Matthew G McLaren, Wim P de Boeij, Wim P de Boeij, } "Immersion and dry scanner extensions for sub-10nm production nodes", Proc. SPIE 9426, Optical Microlithography XXVIII, 942616 (18 March 2015); doi: 10.1117/12.2087112; https://doi.org/10.1117/12.2087112
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