19 March 2015 High-radiance LDP source for mask-inspection application
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Abstract
Actinic mask inspection manufactures are currently searching for high-radiance EUV sources for their tools. LDP source, which was previously used for lithography purposes, was found to be a good candidate as it can provide sufficient power and radiance. Introduction of new techniques, modified modules and fine tuning of operational conditions (discharge pulse energy, discharge frequency, laser) has brought radiance level to 180 W/mm2/sr at plasma or 145 W/mm2/sr as clean-photon. The source has been modified in such a way to improve modules reliability, lifetime and radiance stability even though there is still a room for further improvement. Size of the source system is much smaller than that of the lithography source. A debris mitigation system has been tested. Optical transmission was improved to 77 % and several 8-nm-thick Ru samples were exposed to evaluate contamination and erosion of optics. Preliminary results show low sputter and deposition rates, which supports sufficiently long lifetime of the optics.
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Yusuke Teramoto, Yusuke Teramoto, Bárbara Santos, Bárbara Santos, Guido Mertens, Guido Mertens, Ralf Kops, Ralf Kops, Margarete Kops, Margarete Kops, Alexander von Wezyk, Alexander von Wezyk, Hironobu Yabuta, Hironobu Yabuta, Akihisa Nagano, Akihisa Nagano, Takahiro Shirai, Takahiro Shirai, Noritaka Ashizawa, Noritaka Ashizawa, Kiyotada Nakamura, Kiyotada Nakamura, Kunihiko Kasama, Kunihiko Kasama, } "High-radiance LDP source for mask-inspection application", Proc. SPIE 9422, Extreme Ultraviolet (EUV) Lithography VI, 94220F (19 March 2015); doi: 10.1117/12.2086606; https://doi.org/10.1117/12.2086606
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