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4 December 2008The first on-site evaluation of a new filter optimized for TARC and developer
In previous studies, we identified filter properties that have a strong effect on microbubble formation on the downstream side of the filter membrane. A new Highly Asymmetric Polyarylsulfone (HAPAS) filter was developed based on the findings.
In the current study, we evaluated newly-developed HAPAS filter in environmentally preferred non-PFOS TARC in a laboratory setting. Test results confirmed that microbubble counts downstream of the filter were lower than those of a conventional HDPE filter. Further testing in a manufacturing environment confirmed that HAPAS filtration of TARC at point of use was able to reduce defectivity caused by microbubbles on both unpatterned and patterned wafers, compared with a HDPE filter.
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Toru Umeda, Takeo Ishibashi, Atsushi Nakamura, Junichi Ide, Masaru Nagano, Koichi Omura, Shuichi Tsuzuki, Toru Numaguchi, "The first on-site evaluation of a new filter optimized for TARC and developer," Proc. SPIE 7140, Lithography Asia 2008, 71402Z (4 December 2008);