Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 20: Focussed Session: In-situ optical spectroscopy

DS 20.8: Talk

Wednesday, March 18, 2015, 12:30–12:45, H 0111

Correlation Between Structure and Optical Properties in Organic Mixtures: A Real-Time Study During Thin Film Growth — •Alexander Hinderhofer, 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 is relevant for device optimization as well as for fundamental research [1]. Due to 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 perfluoropentacene and diindenoperylene in situ and in real-time. Comparing the results obtained for the different mixing ratios, 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 favorable 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).