Regensburg 2016 – scientific programme
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DS: Fachverband Dünne Schichten
DS 55: Organic Thin Films III
DS 55.7: Talk
Friday, March 11, 2016, 11:15–11:30, H8
Characterization of charge transfer in weakly interacting organic mixtures — •Valentina Belova1, Alexander Hinderhofer1, Alexander Gerlach1, Frank Schreiber1, Eduard Meister2, Wolfgang Brütting2, Paul Beyer3, and Andreas Opitz3 — 1Institut für Angewandte Physik, Universität Tübingen, Germany — 2Institut für Physik, Universität Augsburg, Germany — 3Institut für Physik, Humboldt-Universität zu Berlin, Germany
To obtain a detailed understanding of the structural and energetic aspects of intermolecular interaction upon mixing we study the CT in thin films of DIP and PEN as donors and PDIR-CN2 and PDIF-CN2 as acceptors, which are relevant for organic electronic devices[1]. Mixing rigid rod-like materials (DIP, PEN) with a compound with flexible alkyl-chains (PDIR-CN2, PDIF-CN2) give rise to many different structural configurations between both species. Choosing the components in binary molecular mixtures[2] we adjust the energy gap between the donor HOMO level and the acceptor LUMO level. We characterize the CT of these mixtures upon electronic excitation (via PL and optical absorption) as well as at the ground-state (via FTIR) in combination with X-ray scattering to define the correlation with structural properties and anisotropic character of the CT.
[1] P.J. Jadhav et.al. Adv. Mater., 24, 6169 (2012); [2] A. Hinderhofer/F. Schreiber, ChemPhysChem, 13, 628 (2012)