Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 111: Nanostructures at Surfaces: Molecular Systems III
O 111.7: Vortrag
Freitag, 24. März 2017, 12:00–12:15, REC/PHY C213
Substrate mediated electronic interactions of organic charge-transfer complexes on Ag(111) — •Kathrin Müller1, Nico Schmidt2, Stefan Link1, Michael Grunst3, Rene Riedel3, Walter Malone4, Abdelkader Kara4, Ulrich Starke1, Milan Kivala3, and Meike Stöhr2 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 3Department of Chemistry and Pharmacy University Erlangen-Nürnberg, Germany — 4Department of Physics University of Central Florida Orlando, USA
The use of organic molecules in electronic devices is gaining increasing interest due to their low cost, flexibility and easy processability. However, organic molecules often show weak intermolecular interactions limiting the charge carrier mobility. The use of electronically complementary molecules, which exhibit strong intermolecular interaction, might overcome this problem. Here we report on the self-assembly and the electronic properties of two complementary molecules containing electron-withdrawing and -donating cyano- and methoxy-groups, respectively, on Ag(111). The investigations of the structural and electronic properties of homogeneous layers containing only one species as well as heterogeneous layers containing both were carried out by STM, STS, XPS, ARPES, UPS, LEED and DFT calculations. The molecules are strongly interacting with each other leading to an alignment of the lowest unoccupied molecular orbitals (LUMOs). However, we also observe strong molecule/substrate interactions and thus we speculate that the LUMO alignment is mediated by the metallic substrate.