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1 January 2003 Marathon evaluation of optical materials for 157-nm lithography
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We present the methodology and recent results on the long-term evaluation of optical materials for 157-nm lithographic applications. We review the unique metrology capabilities that have been developed for accurately assessing optical properties of samples both online and offline, utilizing VUV spectrophotometry with in situ lamp-based cleaning. We describe ultraclean marathon testing chambers that have been designed to decouple effects of intrinsic material degradation from extrinsic ambient effects. We review our experience with lithography-grade 157-nm lasers and detector durability. We review the current status of bulk materials for lenses, such as CaF2 and BaF2, and durability results of antireflectance coatings. Finally, we discuss the current state of laser durability of organic pellicles.
© (2003) Society of Photo-Optical Instrumentation Engineers (SPIE)
Vladimir Liberman, Mordechai Rothschild, Nikolay N. Efremow Jr., Stephen T. Palmacci, Jan H. C. Sedlacek, Andrew Grenville, and Kevin J. Orvek "Marathon evaluation of optical materials for 157-nm lithography," Journal of Micro/Nanolithography, MEMS, and MOEMS 2(1), (1 January 2003).
Published: 1 January 2003

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