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DS: Fachverband Dünne Schichten

DS 18: Organic Thin Films I

DS 18.12: Talk

Wednesday, April 2, 2014, 12:30–12:45, CHE 91

Real-time studies of the impact of intermolecular interactions and steric compatibility on structure-property relations in organic semiconductor blends — •Katharina Broch, Alexander Gerlach, Christopher Lorch, Johannes Dieterle, Jiří Novák, and Frank Schreiber — Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen

An understanding of the structure-property relation in binary blends of organic semiconductors (OSCs) is relevant for device optimization as well as for fundamental research [1]. Due to possible pronounced transient effects, post growth studies are often not sufficient for a detailed characterization of these complex systems [2,3]. Using grazing incidence X-ray diffraction simultaneously with optical spectroscopy techniques we follow the growth of binary blends of the three OSCs pentacene, perfluoropentacene and diindenoperylene in situ in real-time. Comparing the results obtained for the different combinations, we find significant differences in the structure formation during growth of the mixed films as well as pronounced transient effects in the absorption spectra. We discuss these observations in the context of the competing effects of favourable intermolecular interaction and steric incompatibilities [4].

[1] A. Hinderhofer and F. Schreiber, ChemPhysChem 13, (2012), [2] U. Heinemeyer et al., Phys. Rev. Lett. 104, (2010), [3] R. Forker and T. Fritz, Phys. Chem. Chem. Phys. 11, (2009), [4] K. Broch et al., J. Chem. Phys. 139, (2013).