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3 November 1994 Attenuated phase-shifting photomasks fabricated from Cr-based embedded shifter blanks
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Proceedings Volume 2254, Photomask and X-Ray Mask Technology; (1994) https://doi.org/10.1117/12.191963
Event: Photomask Japan '94, 1994, Kawasaki City, Kanagawa, Japan
Abstract
I-line (365 nm) and G-line (436 nm) attenuated phase shifting photomasks have been developed using single layer Cr-based photoblanks. The absorber layer has a composition gradient that allows the desired transmission to be tuned while maintaining control over reflectivity and phase shift. These photoblanks are manufactured in existing facilities, and masks are processed much like conventional opaque Cr-based materials. They can be inspected and repaired on current equipment with slight modifications. Printing has been demonstrated on current generation steppers. Deep UV extendability of these materials is also being studied, with a 5% Deep UV (248 nm) single layer photoblank chemistry already demonstrated.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Franklin D. Kalk, Roger H. French, H. Ufuk Alpay, and Greg P. Hughes "Attenuated phase-shifting photomasks fabricated from Cr-based embedded shifter blanks", Proc. SPIE 2254, Photomask and X-Ray Mask Technology, (3 November 1994); https://doi.org/10.1117/12.191963
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