Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 27: Organic Thin Films II
DS 27.8: Vortrag
Mittwoch, 2. April 2014, 17:00–17:15, CHE 91
In-situ GIWAXS on slot die coated highly conductive PEDOT:PSS as electrode for ITO-free organic electronics: Crystallinity and molecular orientation — •Claudia M. Palumbiny1, Feng Liu2, Cheng Wang3, Alexander Hexemer3, Eric Schaible3, Thomas P. Russel2, and Peter Müller-Buschabum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2UMass Amherst, Department of Polymer Science and Engineering, Amherst, MA 01003, USA — 3Advanced Light Source, LBNL, Berkeley, CA 94720, USA
The potential to manufacture organic photovoltaic devices on flexible substrates enables roll-to-roll mass production. Thereby, techniques such as slot die coating are used. In this study, we use a mini slot die coater, specially designed and made at ALS Berkeley in collaboration with UMass Amherst and Jema Technology, Berkeley, for the implementation at a synchrotron facility. This enables in-situ Grazing Incident Wide Angle X-ray Scattering measurements during the slot die coating process. It allows us to follow the changes in molecular orientation and crystallinity. Further, there are still challenges for roll-to-roll processed flexible devices such as the brittleness of ITO. In this study we therefore investigate PEDOT:PSS modified with the co-solvent ethylene glycol (EG) during the slot die process with in-situ GIWAXS. The results are correlated to the conductivity of the thin films. Doping with EG increases the conductivity of PEDOT:PSS films up to the value of ITO conductivity[1] and can thereby replace ITO as a stand-alone electrode. [1] Palumbiny, C.M. et al., 2014 (submitted)