29 May 2012 Laser-produced plasma-based extreme-ultraviolet light source technology for high-volume manufacturing extreme-ultraviolet lithography
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J. of Micro/Nanolithography, MEMS, and MOEMS, 11(2), 021111 (2012). doi:10.1117/1.JMM.11.2.021111
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.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE)
Junichi Fujimoto, Hakaru Mizoguchi, Tamotsu Abe, Satoshi Tanaka, Takeshi Ohta, Tsukasa Hori, Tatsuya Yanagida, Hiroaki Nakarai, "Laser-produced plasma-based extreme-ultraviolet light source technology for high-volume manufacturing extreme-ultraviolet lithography," Journal of Micro/Nanolithography, MEMS, and MOEMS 11(2), 021111 (29 May 2012). https://doi.org/10.1117/1.JMM.11.2.021111
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