Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster: Organic Electronics and Photovoltaics, Molecular Excitations
CPP 50.38: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P3
Analysis of charge transfer states at organic single crystal interfaces — •Sebastian Hammer1 and Jens Pflaum1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
The formation, dissociation and recombination of charge transfer (CT) states at organic-organic interfaces are vital for the performance of organic opto-electronical devices. However, the energy and dynamics of CT-states strongly depend on the position of the participating molecular frontier orbitals as well as on their respective spatial arrangement.
Therefore, we have chosen chemically and structurally well-defined hetero-interfaces, comprised of organic single crystal surfaces and vacuum deposited molecular adsorbant layers, to analyze the efficiency of CT-state generation and the effective amount of transferred charge. For this purpose, various optical techniques such as locally resolved Raman spectroscopy are applied. In case of the latter, the amount of transferred charge is estimated by the linear frequency shift of selected molecular vibrational modes [1].
The methodical and analytical procedure is demonstrated for the model system Rubrene/C60 at different temperatures and crystallographic orientations.
[1] Matsuzaki, S. et al., Solid State Commun. 33, 403 (1980)