3 September 1999 Method for planarizing rigid graphite for use as an x-ray mask substrate
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Proceedings Volume 3875, Materials and Device Characterization in Micromachining II; (1999) https://doi.org/10.1117/12.360465
Event: Symposium on Micromachining and Microfabrication, 1999, Santa Clara, CA, United States
Abstract
The usefulness of thin (< 250 micrometers ) rigid graphite plates as x-ray mask substrates for micromachining and LIGA applications has been demonstrated. Rigid graphite offers unique properties, such as moderate x-ray absorption and optimal filtration of synchrotron radiation, relatively low cost, compatibility with additive (electroplating) and subtractive (etching, micromachining) processes for absorber patterning. The surface roughness of these substrates is associated with the inherent porosity of a commercially available rigid graphite material (typical Ra values are in the range of 1 - 2 micrometers ). The surface roughness of this rigid graphite sheet is reduced down to a 0.1 - 0.2 micrometers Ra value by polishing. To reduce surface roughness further and make the substrate usable for fine e-beam or optical absorber imaging, additional smoothing is required. In this paper, the surface characteristics of rigid graphite sheets are analyzed and a glazing technique developed to smooth the graphite surface is described. This technique employs hard baking process of novolac-based resins. An average Ra roughness value of approximately 5 nm was obtained after 5 coating using novolac-based AZ type resist.
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Philip J. Coane, Philip J. Coane, Robert Giasolli, Robert Giasolli, Olga Vladimirsky, Olga Vladimirsky, Yuli Vladimirsky, Yuli Vladimirsky, } "Method for planarizing rigid graphite for use as an x-ray mask substrate", Proc. SPIE 3875, Materials and Device Characterization in Micromachining II, (3 September 1999); doi: 10.1117/12.360465; https://doi.org/10.1117/12.360465
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