Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 29: Organic Thin Films I

DS 29.9: Talk

Wednesday, March 22, 2017, 11:45–12:00, CHE 91

Combined structural and optical real-time study on growth of a charge transfer complex — •Valentina Belova, Alexander Hinderhfer, Alexander Gerlach, and Frank Schreiber — Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany

Molecular arrangement and structure formation in binary mixed thin film organic semiconductors being in a close correlation with intermolecular interaction [1] directly influence device functionality [2]. We present a real-time investigation of structure evolution during growth (by organic molecular beam deposition OMBD) of a small-molecule donor:acceptor pair (diindenoperylene DIP : N,N0-1H,1H-perfluorobutyl-cyanoperylenediimide PDIF-CN2 [Polyera ActivInk N1100]) combining X-ray scattering methods with differential reflectance spectroscopy (DRS) in the visible range. We found strong changes in the structural and optical properties upon mixing of donor and acceptor molecules that evidence the complex formation. A strong influence of substrate temperature was observed. DRS was performed during film growth in order to establish the correlation between changes in optical spectra due to the intermolecular coupling and structural/mixing behavior. The analysis is complemented with atomic force microscopy (AFM), ellipsometry, photoluminescence and UV-Vis absorption. [1] J. Dieterle et al. J. Phys. Chem. C, 2015, 119 (47) 26339; [2] A. Opitz et al. Phys. Status Solidi A 2009, 206 (12) 2683