Regensburg 2010 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.34: Poster
Mittwoch, 24. März 2010, 15:00–17:30, Poster A
Controlling the energy levels at interfaces between conjugated organic materials and electrodes — •Benjamin Bröker1, Ralf-Peter Blum1, Georg Heimel1, Johannes Frisch1, Jürgen P. Rabe1, Antje Vollmer2, Oliver T. Hofmann3, Egbert Zojer3, Ralph Rieger4, Klaus Müllen4, and Norbert Koch1 — 1Institut für Physik, Humboldt-Universität zu Berlin, D-12389 Berlin, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie -Bessy II, D-12489 Berlin, Germany — 3Institut of Solid State Physics, Graz University of Technology, A-8010 Graz, Austria — 4Max Planck Institut für Polymerforschung, D-55128 Mainz, Germany
In the past decades, the field of organic electronics has made tremendous progress, which led to significant increase in device performance. However, the interfaces between the electrodes and the conjugated organic material (COM) can still be identified as one of the key areas for device improvement. Several strategies towards adjusting the electronic levels of the electrode-COM interface exist, with one of them being the adsorption of molecules that undergo a charge-transfer-type reaction with the electrode materials. This modifies the energy level alignment and leads to significantly decreased injection barriers for subseqently deposited COM layers. In this work we present an overview of donor and acceptor molecules. By application of thin layers of these molecules a tunability of the substrate work function over a range of almost 3eV was achieved. Furthermore a variety of electronic as well as structural phenomena were identified at these interfaces that can play an important role in the charge injection process.