SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.24: Poster

Monday, March 27, 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 Koch^1,2 — 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.