Plasma physics and radiation hydrodynamics in developing an extreme ultraviolet light source for lithography
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita, Osaka 565-0871 (Japan)
- Institute for Laser Technology, 2-6 Yamada-Oka, Suita, Osaka 565-0871 (Japan)
- Advanced Photon Research Center, Kansai Research Establishment, Japan Atomic Energy Agency, 8-1 Umemidai Kizu-cho, Soraku-gun, Kyoto 619-0215 (Japan)
- Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachoji, Tokyo 192-0397 (Japan)
- Faculty of Engineering, Yamanashi University, 4-4-37, Takeda, Kofu, Yamanashi 400-8510 (Japan)
- National Institute of Fusion Science, 322-6, Oroshi-cho, Toki, Gifu 509-5292 (Japan)
Extreme ultraviolet (EUV) radiation from laser-produced plasma (LPP) has been thoroughly studied for application in mass production of next-generation semiconductor devices. One critical issue for the realization of an LPP-EUV light source for lithography is the conversion efficiency (CE) from incident laser power to EUV radiation of 13.5-nm wavelength (within 2% bandwidth). Another issue is solving the problem of damage caused when debris reaches an EUV collecting mirror. Here, we present an improved power balance model, which can be used for the optimization of laser and target conditions to obtain high CE. An integrated numerical simulation code has been developed for the target design. The code agrees well with experimental results not only for CE but also for detailed EUV spectral structure. We propose a two-pulse irradiation scheme for high CE, and reduced ion debris using a carbon dioxide laser and a droplet or a punch-out target. Using our benchmarked numerical simulation code, we find a possibility to obtain CE up to 6-7%, which is more than twice that achieved to date. We discuss the reduction of ion energy within the two-pulse irradiation scheme. The mitigation of energetic ions by a magnetic field is also discussed, and we conclude that no serious instability occurs due to large ion gyroradius.
- OSTI ID:
- 21120403
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 5; Other Information: DOI: 10.1063/1.2907154; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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