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Laser-based manufacturing of metallic conducting paths

: Vedder, C.; Stollenwerk, J.; Pirch, N.; Wissenbach, K.

Washio, Kunihiko ; Laser Institute of America -LIA-:
ICALEO, 30th International Congress on Applications of Lasers & Electro-Optics. Congress proceedings. CD-ROM : October 23 - 27, 2011, Orlando, FL, USA, Hilton in the Walt Disney World Resort
Orlando, Fla.: LIA, 2011 (LIA 614)
ISBN: 978-0-912035-94-9
International Congress on Applications of Lasers & Electro Optics (ICALEO) <30, 2011, Orlando/Fla.>
Fraunhofer ILT ()

Large-scale OLEDs, solar cells or heated windows have in common that they all are in need of conducting paths for collecting or distributing electricity on poorly or non-conducting surfaces. But common techniques for the production of conducting paths in OLED devices are time- and energy-consuming and therefore expensive since they include high vacuum sputtering and photolithographic processes: More than 90% of the carefully applied metal coating has to be removed in an etching process leaving used etchants for recycling. Common solar cells' conducting paths are made by screen-printing a silver paste onto the surface and then treating the applied structure in an energy-consuming furnace process. The Fraunhofer ILT - in cooperation with Philips Lighting - developed a laser-based process to 'write' metallic conducting paths of widths down to 35 ?m onto ITO-coated glass with speeds of up to 2.5 m/s in ambient atmosphere. The conducting paths consist of aluminum, copper, silver or a similar material and show specific resistances of about and sheet resistances of about 0.04 Ohms per square which is sufficient for OLED applications. A multiple coating can even reduce resistances further.