Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Organic Electronics and Photovoltaics III

CPP 21.5: 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.