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Proceedings Paper

Processing multilayer systems using femtosecond, picosecond, and nanosecond laser pulses at different wavelengths
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Paper Abstract

We performed ablation studies on multi-layer systems at different wavelength - pulse duration combinations. The multi-layer systems of interest, 150 nm thin indium tin oxide (ITO), 200 thin polyaniline (PANI) on 1 micrometers thick photo resist, and 280 nm PPV/pedot layer-combination on 150 nm thin ITO are optically transparent and used for a variety of industrial applications. One important goal of the study was to determine the possible process window for a complete removal of only the top layer, leaving the remaining layer basically unharmed. The investigations were conducted with the following wavelength - pulse duration combinations: 800 nm and 180 fs, 800 nm and 5 ps, 266 nm and 150 fs, 266 nm and 5 ns, 532 nm and 5 ns. We generated micro dots, lines and areas to determine the damage threshold, the processing quality and the processing speed for the specified application of selective layer removal. The structures were analyzed by means of optical and atomic force microscopy. In some cases, we observed a strong pulse duration dependence in the ablation threshold, an indication for the observed difficulties using laser pulse in the ns range. Comparative studies at different wavelengths demonstrate that laser pulses in the UV are not necessarily always a first choice to achieve a precise removal of the optically transparent top layer.

Paper Details

Date Published: 18 June 2002
PDF: 11 pages
Proc. SPIE 4637, Photon Processing in Microelectronics and Photonics, (18 June 2002); doi: 10.1117/12.470619
Show Author Affiliations
David Ashkenasi, Laser- und Medizin-Technologie GmbH (Germany)
Arkadi Rosenfeld, Max-Born-Institute (Germany)

Published in SPIE Proceedings Vol. 4637:
Photon Processing in Microelectronics and Photonics
Jan J. Dubowski; Koji Sugioka; Malcolm C. Gower; Willem Hoving; Richard F. Haglund; Alberto Pique; Frank Traeger; Jan J. Dubowski; Willem Hoving, Editor(s)

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