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29 June 1998 Assessment of optical coatings for 193-nm lithography
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We present an assessment of antireflective coatings for 193-nm lithography. Coatings from nine suppliers were exposed in a nitrogen ambient for up to 1.5 billion pulses at 15 mJ/cm2/pulse at 400 Hz. Sensitive metrology, developed for this study, included reflectance/transmittance measurements, in-situ ratiometric transmission measurements, and interferometric calorimetry for absorption measurements. The coatings from at least two suppliers withstood greater than 1 billion pulses with no observable degradation. Catastrophic damage observed on some samples included blistering and a dramatic transmission drop. Such damage occurred rather early (less than 100 million pulses).
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vladimir Liberman, Mordechai Rothschild, Jan H. C. Sedlacek, Ray S. Uttaro, Andrew Grenville, Allen Keith Bates, and Chris K. Van Peski "Assessment of optical coatings for 193-nm lithography", Proc. SPIE 3334, Optical Microlithography XI, (29 June 1998);

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