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Journal of Micro/Nanolithography, MEMS, and MOEMS

Laser-produced plasma-based extreme-ultraviolet light source technology for high-volume manufacturing extreme-ultraviolet lithography
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Paper Abstract

Since 2002, we have been developing a CO2-Sn-laser plasma produced (LPP) extreme-ultraviolet (EUV) light source, the most promising solution as the 13.5-nm high-power (>200 W) light source for high-volume manufacturing (HVM) EUV lithography. Because of its high efficiency, power scalability, and spatial freedom around plasma, we believe that the CO2-Sn-LPP scheme is the most feasible candidate as the light source for EUVL. By now, our group has proposed several unique original technologies, such as CO2 laser-driven Sn plasma generation, double-laser pulse shooting for higher Sn ionization rate and higher CE, Sn debris mitigation with a magnetic field, and a hybrid CO2 laser system that is a combination of a short-pulse oscillator and commercial cw-CO2 amplifiers. The theoretical and experimental data have clearly demonstrated the advantage of combining a laser beam at a wavelength of the CO2 laser system with Sn plasma to achieve high CE from driver laser pulse energy to EUV in-band energy. We have the engineering data from our test tools, which include 20-W average clean power, CE = 2.5%, and 7 h of operating time; the maximum of 3.8% CE with a 20-μm droplet, 93% Sn ionization rate, and 98% Sn debris mitigation by a magnetic field. Based on these data, we are developing our first light source for HVM: "GL200E." The latest data and the overview of EUV light source for the HVM EUVL are reviewed in this paper.

Paper Details

Date Published: 29 May 2012
PDF: 15 pages
J. Micro/Nanolith. MEMS MOEMS 11(2) 021111 doi: 10.1117/1.JMM.11.2.021111
Published in: Journal of Micro/Nanolithography, MEMS, and MOEMS Volume 11, Issue 2
Show Author Affiliations
Junichi Fujimoto, Gigaphoton Inc. (Japan)
Hakaru Mizoguchi, Gigaphoton Inc. (Japan)
Tamotsu Abe, Komatsu Ltd. (Japan)
Satoshi Tanaka, Komatsu Ltd. (Japan)
Takeshi Ohta, Komatsu Ltd. (Japan)
Tsukasa Hori, Komatsu Ltd. (Japan)
Tatsuya Yanagida, Komatsu Ltd. (Japan)
Hiroaki Nakarai, Komatsu Ltd. (Japan)

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