Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 23: Organic Semiconductors (jointly with CPP/HL)
DS 23.8: Vortrag
Dienstag, 21. März 2017, 11:45–12:00, POT 251
The Influence of Molecular Packing on Charge-Transfer States at the Pentacene/Perfluoropentacene Interface — •Andre Rinn1, Tobias Breuer1, Julia Wiegand2, Michael Beck2, Jens Hübner2, Michael Oestreich2, Gregor Witte1, and Sangam Chatterjee3 — 1Faculty of Physics and Materials Science Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — 2Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany — 3Institute of Experimental Physics I, Justus-Liebig University Giessen, Heinrich-Buff-Ring 16, D-35392 Gießen, Germany
We study different model systems of intermixed and layered heterostructures of pentacene and perfluoropentacene by means of time resolved photoluminescence spectroscopy to investigate the impact of molecular packing at the interface on the optical properties. We assign the different PL signals visible in the heterostructures to their respective origin and find an increase in the PL intensity of the charge-transfer signal for pi-stacking at the interface. Significantly slower carrier dynamics are measured for the charge-transfer states when compared to bulk exciton emission which are quenched by singlet exciton fission.