Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 50: [CPP] Organic Electronics and Photovoltaics III (Joint Session DS/CPP/HL/O)
O 50.5: Talk
Wednesday, March 24, 2010, 10:30–10:45, H37
Structural analysis of photoactive polymer blend films on textured polymeric and inorganic substrates — •Robert Meier1, Matthias A. Ruderer1, Gunar Kaune1, Alexander Diethert1, Fabian Markl1, Volker Körstgens1, Johannes Wiedersich1, Stephan V. Roth2, and Peter Müller-Buschbaum1 — 1TU München, Physik Department LS E13, James-Franck-Straße 1, 85747 Garching — 2HASYLAB at DESY, Notkestraße 85, 22603 Hamburg
Due to their large chemical variety photoactive conducting polymers are of great interest for versatile applications such as organic photovoltaics. In order to improve the device characteristics not only the polymer film but also the rest of the device has to be optimized regarding light absorption and charge carrier separation. Therefore the focus of this work is put on the use of structured substrates in order to improve the light absorption and the overall device performance. A new route based on solution casting is introduced to structure the electron blocking PEDOT:PSS layer. Absorption spectra of polymer blend films spincoated on such structured substrates show promising aspects for their suitability for organic photovolatics. In addition the inner film morphology of a polymer blend based on M3EH-PPV and F8BT spincoated on structured channel-like substrates is investigated using GISAXS measurements. The obtained results show a dependence of the film morphology and the topographic shape on the etched depth of the channels. The study is complemented with atomic force and scanning electron microscopy measurements.