Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.84: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Localized charge transfer between a molecular acceptor and polymer donors — Kue Surk Park1, •Jörn-Oliver Vogel1, Dessislava Sainova2, Silvia Janietz2, Jürgen Rabe1, and Norbert Koch1 — 1Institut für Physik, Humboldt Universität zu Berlin ,Berlin — 2Fraunhofer-Institute of Applied Polymer Research, Golm, Germany
The environmental stability of poly(3-hexylthiophene) (P3HT) can be significantly improved by incorporation of (1,4-dithienyl-2,3,5,6-tetrafluorobenzene) (TFT) units in the main chain, which leads to an increase of the average polymer ionization energy in thin films as measured by photoemission spectroscopy. P3HT and P3HT-TFT copolymers can be rendered highly conductive by "doping" with the electron acceptor tetrafluoro-tetracyanoquinodimethane (TCNQF4), i.e., the formation of molecule-polymer charge transfer complexes. As the average ionization energy of P3HT-TFT increases for increasing TFT concentration, a decrease in the charge transfer efficiency with TCNQF4 could be expected. However, our infrared absorption spectroscopy investigations on such charge transfer systems indicate that the charge transfer is independent of the TFT concentration within copolymers. This suggests that the molecule-polymer charge transfer is due to a highly localized interaction between TCNQF4 and conjugated thiophene units.