Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Organic-Inorganic Systems II: Energy Level Alignment
O 51.5: Vortrag
Mittwoch, 9. März 2016, 11:45–12:00, S054
Single molecules of Sexiphenyl on In2O3(111) — •Margareta Wagner1, Michael Hollerer2, Martin Sterrer2, Michael Ramsey2, Lynn A. Boatner3, Michael Schmid1, and Ulrike Diebold1 — 1Institut für Angewandte Physik, TU Wien, Österreich — 2Institut für Physik, Karl-Franzens-Universität Graz, Österreich — 3Material Science and Technology Division, ORNL, USA
Indium oxide is one of the most important transparent conductive oxides (TCOs), and commonly used as a contact material. Sexiphenyl (6P) is a rod-like molecule and twice as long as the substrate surface lattice parameter of the (111) surface of In2O3 single crystals.
Here, the adsorption of 6P is investigated with STM. We show that 6P has a specific adsorption site, but no well-ordered monolayer is formed. In empty states STM, the single 6P appears as a zig-zag line at bias voltages below +2V. At +2V the molecule starts to appear straight, which is associated with tunneling into the LUMO state. At +2.7V the apparent shape changes again into two bright features, corresponding to the LUMO+1.