Regensburg 2010 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.2: Poster
Mittwoch, 24. März 2010, 15:00–17:30, Poster A
Photoluminescence in coevaporated pentacene- perfluoropentacene films — •Falk Anger1,2, J. Oriol Ossó2, Ute Heinemeyer1, Katharina Broch1, Abel Roigé2, Reinhard Scholz3, Alexander Gerlach1, and Frank Schreiber1 — 1Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen — 2MATGAS 2000 AIE, Campus de la UAB, 08193 Bellaterra — 3Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching
One of the crucial issues in complex organic electronic device structures is that of the coupling between different organic components. This is not only relevant for device applications, but also important from a fundamental point of view, since many properties, whether charge transport or optical spectra depend on the molecule-molecule coupling.
We present a study of the intermolecular coupling in films of pentacene (PEN) and perfluoropentacene (PFP) single and coevaporated films, which form organic donator-acceptor systems. The structural similarity of PEN and PFP is expected to promote intermixing and thus the chance of spectral coupling. The photoluminescence spectra of the coevaporated films on SiO2 and ITO reveal pronounced optical coupling effects which depend on the mixing ratio of the molecules. New features appear in the spectra, which cannot be explained by using a linear combination of the spectra of the individual components. These coupling effects and ideas for their interpretation are discussed based on spectra at high and low temperature under vacuum atmosphere.