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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Organic-Inorganic Systems II: Energy Level Alignment (organized by O)

CPP 37.5: 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.