Regensburg 2016 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 55: Organic Thin Films III
DS 55.1: Vortrag
Freitag, 11. März 2016, 09:30–09:45, H8
Donor-acceptor molecular interfaces in binary mixtures of organic semiconductors: Diindenoperylene(DIP):[hexafluoro]-tetracyanonaphtoquinodimethane([F6]-TCNNQ) vs Sexithiophene(6T):F6TCNNQ — •Giuliano Duva1, Paul Beyer2, Alexander Hinderhofer1, Andreas Opitz2, Alexander Gerlach1, and Frank Schreiber1 — 1Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen (Germany) — 2Humboldt-Universität zu Berlin, Department of Physics, Brook-Taylor-Str. 6, 12489 Berlin (Germany)
Binary mixtures of organic semiconductors[1] involve formation of heterointerfaces between materials with different HOMO-LUMO energies. This may lead to partial or integer charge-transfer (CT) between the compounds in the form of either full ionization or frontier orbital hybridization[2]. The different size and shape of the molecular components has a great impact on the structure, leading to complex mixing scenarios from complete phase separation to mixed-crystal formation[1]. Overall, the mixing free energy can be expressed as a function of several parameters involving anisotropic interactions, implicitly taking into account the overlap between frontier orbitals. In this study we combine mixtures of DIP and [F6]TCNNQ with mixtures of 6T and F6TCNNQ in order to vary these parameters and study their impact on the CT. We demonstrate the formation of mixed co-crystal by X-ray scattering, whereas the corresponding CT states are probed by several spectroscopy methods (UV-Vis, IR, Raman).[1]A. Hinderhofer et al. Chem.Phys.Chem.13(2012);[2]H. Méndez et al. Nat.Comm.6(2015)