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Proceedings Paper

Current status and future prospect of immersion lithography
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Paper Abstract

Immersion lithography is rapidly approaching the manufacturing phase. A production-quality exposure tool system with NA=1.07 (Nikon NSR-S609B) was constructed to target the start of immersion lithography for IC manufacturing in 2006. Its projection optics have very small wavefront aberration and lowest local flare levels. The overlay issue has been analyzed, and its cause was found to be evaporation cooling. With the tandem stage and local fill nozzle implemented in the S609B, we have successfully avoided the evaporation cooling so that the good wet-to-dry mix-and-match overlay data have been obtained. The major part of immersion specific defects is caused by dried water-droplets, i.e. water-marks. The local fill nozzle has eliminated this defectivity by avoiding air flow in the nozzle. In the future, water immersion with NA=1.30 optics will be used for half-pitch 45nm manufacturing. Finer pattern imaging down to 32nm seems to need high-index material immersion or nonlinear double patterning, but these have several issues and concerns to be solved.

Paper Details

Date Published: 15 March 2006
PDF: 12 pages
Proc. SPIE 6154, Optical Microlithography XIX, 615408 (15 March 2006); doi: 10.1117/12.656887
Show Author Affiliations
Soichi Owa, Nikon Corp. (Japan)
Hiroyuki Nagasaka, Nikon Corp. (Japan)
Katsushi Nakano, Nikon Corp. (Japan)
Yasuhiro Ohmura, Nikon Corp. (Japan)

Published in SPIE Proceedings Vol. 6154:
Optical Microlithography XIX
Donis G. Flagello, Editor(s)

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