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Proceedings Paper

Unique freeze cleaning technology
Author(s): Daisuke Matsushima; Kensuke Demura; Sadayuki Jimbo; Kei Hattori
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Paper Abstract

In this work, a novel chemical-free technique is proposed to remove adsorbed particles of less than 100 nm from a substrate. More specifically, the small particles buried under the "stagnant layer" were removed using a process that relied on the force generated by volumetric expansion on rapid freezing of supercooled water. In the process, water penetrated into the small (narrow) spaces via the capillary force; it then flowed into the narrow interfacial gap between the substrate and particles, and lifted the particles off the substrate via the volumetric expansion force on ice formation. Because fine patterns have no such gaps, they are not damaged during this process. In other words, unlike conventional cleaning technologies, such as mega sonic cleaning and two-fluid jet cleaning, this cleaning process is able to specifically target the small particles while the fine patterns are unaffected.

Paper Details

Date Published: 23 March 2020
PDF: 9 pages
Proc. SPIE 11326, Advances in Patterning Materials and Processes XXXVII, 113260P (23 March 2020); doi: 10.1117/12.2551972
Show Author Affiliations
Daisuke Matsushima, Shibaura Mechatronics Corp. (Japan)
Kensuke Demura, Shibaura Mechatronics Corp. (Japan)
Sadayuki Jimbo, Shibaura Mechatronics Corp. (Japan)
Kei Hattori, Shibaura Mechatronics Corp. (Japan)


Published in SPIE Proceedings Vol. 11326:
Advances in Patterning Materials and Processes XXXVII
Roel Gronheid; Daniel P. Sanders, Editor(s)

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