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Proceedings Paper

Laser based hybrid inkjet printing of nanoink for flexible electronics
Author(s): Seung Hwan Ko; Jaewon Chung; Yeonho Choi; Costas P. Grigoropoulos; Nicole R. Bieri; Tae-youl Choi; Cedric Dockendorf; Dimos Poulikakos
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Paper Abstract

Many applications require delivery of small quantities of functional materials into locations on a substrate in the form of liquid solution. Consequently, interest in nongraphical inkjet printing is growing. In addition, higher resolution for printing flexible electronics is becoming more critical to enhance the performance of printing electronics. Since the resolution of inkjet process is limited by the nozzle size and the statistical variation of droplet flight and spreading phenomena, hybrid inkjet printing has emerged as an attractive processing method. In this work, surface monolayer protected gold nanoparticle was printed in a liquid solution form and cured by laser irradiation to fabricate electrically conductive microlines on glass or polymer substrate at a reduced temperature. Continuous laser curing enabled local heating and the morphology could be controlled as well. Thermal penetration into the substrate could be minimized by using pulsed laser beam. Nanoparticle film was effectively removed by applying femtosecond laser, so that small feature size was obtained. Printing on a heated substrate has advantages over room temperature printing. The solvent evaporates soon after contact, so that a thick layer can be deposited with high jetting frequency. The rapid liquid evaporation also eliminated uneven wetting problems and the smaller feature size was obtained.

Paper Details

Date Published: 12 April 2005
PDF: 8 pages
Proc. SPIE 5713, Photon Processing in Microelectronics and Photonics IV, (12 April 2005); doi: 10.1117/12.591914
Show Author Affiliations
Seung Hwan Ko, Univ. of California/Berkeley (United States)
Jaewon Chung, Korea Univ. (South Korea)
Yeonho Choi, Univ. of California/Berkeley (United States)
Costas P. Grigoropoulos, Univ. of California/Berkeley (United States)
Nicole R. Bieri, ETH Zurich (Switzerland)
Tae-youl Choi, ETH Zurich (Switzerland)
Cedric Dockendorf, ETH Zurich (Switzerland)
Dimos Poulikakos, ETH Zurich (Switzerland)

Published in SPIE Proceedings Vol. 5713:
Photon Processing in Microelectronics and Photonics IV
Jim Fieret; David B. Geohegan; Friedrich G. Bachmann; Willem Hoving; Frank Träger; Peter R. Herman; Jan J. Dubowski; Tatsuo Okada; Kunihiko Washio; Yongfeng Lu; Craig B. Arnold, Editor(s)

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