ASML’s 300mm scanner-systems are built on the TWINSCAN (XT/NXT) platform and yield high productivity levels for dry as well as immersion litho-scanners. NXT:1980Di immersion scanners yield productivity levels as high as 275wph while maintaining the overlay accuracy. The NXT:1980Di can be equipped with a new leveling mode that results in a significant reduction of the time that is spent on measuring the wafer focus height map. In the new leveling mode the focus height map is measured employing the full width of the level sensor and thereby minimizing the number of leveling scans. In this paper we describe the implementation of the LIL-method in the TWINSCAN platform design. Here, we report on the focus / leveling performance for both test as well as customer product wafers, and present a productivity outlook on the performance gain for a selected set of exposure use-cases.
Bram van Hoof, Arjan Holscher, Ralf Gommers, Jeroen Cottaar, Marcel Raas, Samah Khalek, Jan van Kemenade, Maarten Voncken, Roelof de Graaf, Elliot Oti, Stefan Weichselbaum, Richard Droste, ByeongSoo Lee, Chansam Chang, Young Seog Kang, Young Ha Kim, Jeong-Heung Kong, Jong Hoon Jang, YoungSun Nam, and Hyunwoo Hwang, "Layout independent leveling (LIL) on NXT:1980Di immersion scanners for enhanced productivity," Proc. SPIE 10147, Optical Microlithography XXX, 101471A (Presented at SPIE Advanced Lithography: March 02, 2017; Published: 24 March 2017); https://doi.org/10.1117/12.2259794.
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