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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.24: Poster
Montag, 27. März 2023, 18:00–20:00, P3
Surface doping of rubrene single crystals by molecular electron donors and acceptors — •Christos Gatsios1, Andreas Opitz1, Sebastian Hammer3, Jens Pflaum3, Yadong Zhang4, Stephen Barlow4, Seth R. Marder5, and Norbert Koch1,2 — 1Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany — 3Experimentelle Physik VI, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany — 4Renewable and Sustainable Energy Institute (RASEI), University of Colorado, Boulder, CO 80309, USA — 5Renewable and Sustainable Energy Institute (RASEI), Department of Chemical and Biological Engineering, Department of Chemistry, and Materials Science and Engineering Program, University of Colorado, Boulder, CO 80309, USA
Molecular doping can be used as a method to control the electronic energy levels and charge carrier densities of the organic semiconductor via charge transfer interactions with electron-donating or electron-accepting molecules. This work seeks to understand the mechanisms of interface engineering by focusing on the surface doping of rubrene single-crystals by molecular electron donors (CoCp2) and acceptors (Mo(tfd-CO2Me)3). Our angle-resolved photoemission results show that deposition of molecular dopants on rubrene shifts the valence band with respect to the Fermi level, thus changing the p- (n-) character of the surface, while the electronic band parameters remain essentially unaffected.