Berlin 2008 – scientific programme

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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