Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.11: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Control of surface electronic parameters of ITO using dipolar monomolecular layers. — •Meysam Raoufi1, Ulrich Hörmann1, Emil list Kratochvil2, and Dieter Neher1 — 1University of Potsdam, Institute of Physics and Astronomy, Potsdam-Golm, Germany — 2Humboldt University, Institute for Physics, Berlin, Germany
In organic electronic devices, the injection of holes and electrons from the electrodes into the organic semiconductors is a key issue for their efficient operation. Different chemical and physical treatments have been proposed to improve hole injection and minimize the injection barrier height as a result of increasing the work function of ITO. A particularly interesting approach is the deposition of dipole layers by molecular self-assembly[1,2].
Here, by applying self assembled monolayers of different phosphonic acids, we study how the efficiency of hole injection across a hybrid surface correlates with the change in barrier height. Fine tuning of the injection barrier is achieved by mixing molecules with different electrostatic dipoles. Finally, by incorporating photo-switchable molecules into the SAM, we gain control over the energetics at the organic/inorganic interface and its injection properties.
1. A. Sharma, A. Haldi, P. J. Hotchkiss, S. R. Marder, and B. Kippelen, J. Appl. Phys. 105, (2009). 2. I. Lange, S. Reiter, M. Pätzel, A. Zykov, A. Nefedov, J. Hildebrandt, S. Hecht, S. Kowarik, C. Wöll, G. Heimel, and D. Neher, Adv. Funct. Mater. 24, 7014 (2014).