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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 6: Electronic+Optical Properties
CPP 6.7: Talk
Monday, February 25, 2008, 15:45–16:00, C 230
Localized Charge Transfer in a Molecularly Doped Conducting Polymer — •Emad F. Aziz1, Antje Vollmer1, Stefan Eisebitt1, Wolfgang Eberhardt1, Patrick Pingel2, Dieter Neher2, and Norbert Koch3 — 1BESSY GmbH, Berlin, Germany — 2Universität Potsdam, Potsdam, Germany — 3Humboldt-Universität zu Berlin, Berlin, Germany
Upon doping conjugated polymers can become highly conductive and thus important for the further development of all-organic opto-electronic devices. However, very little is known about the nature of donor/acceptor charge transfer (CT) in molecularly doped conjugated polymers. We present evidence for localized CT complex formation between the prototypical organic donor poly(3-hexylthiophene) (P3HT) and the molecular acceptor tetrafluoro-tetracyano- quinodimethane (F4TCNQ) in thin films by combining X-ray absorption near edge structure (XANES) measurements with theoretical modeling using density functional theory (DFT). This CT leads to molecular distortions and self- localization of the new hybrid energy levels on short single polymer chain segments.
E. F. Aziz, A. Vollmer, S. Eisebitt, W. Eberhardt, P. Pingel, D. Neher, N. Koch, Adv. Mater. 2007, 19, 3257-3260