Development of Xe-filled capillary discharge extreme ultraviolet radiation source for semiconductor lithography

摘要

An EUV radiation source development with discharge-produced plasma (DPP) has been started in Gotenba branch of EUVA Hiratsuka R&D center. For the early stage of the development, fundamental characteristics of DPP including current, voltage, EUV energy and spectrum in EUV region were studied. A capillary of which the inner diameter was 2.3 nun. and Xe gas were used as a source to be expected in-band EUV radiation from magnetically-compressed Z-pinch plasma. An all-solid-state magnetic pulse compression generator was employed, which can deliver the current of 14 kA into the capillary load with the rise time of approximately 500 ns. In-band EUV energy and spectroscopic measurements were carried out. It was found that the in-band EUV energy increased with increasing the current amplitude and/or the pressure of filled Xe gas. The highest in-band EUV energy obtained was 8 mJ per unit solid angle.