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O: Fachverband Oberflächenphysik

O 95: Metal Substrates: Adsorption of Atoms and Inorganic Molecules

O 95.6: Vortrag

Donnerstag, 23. März 2017, 16:30–16:45, WIL A317

LT-STM study of the structural and electronic properties of triazatruxene molecules on Ag(111) — •Anja Bauer¹, Florian Singer¹, Philipp Erler¹, Markus Maier², Rainer Winter², Yuriy Dedkov¹, and Mikhail Fonin¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — ²Fachbereich Chemie, Universität Konstanz, 78457 Konstanz, Germany

The opportunity of tuning the electrical and spin dependent properties of molecules is of great interest since this could enable the fabrication of molecule-based functional devices. Besides the stabilization and con- trolled manipulation of the charge and spin states, it is important to learn about the structural properties like the adsorption geometry and the orientation of the molecules on different substrates.
We investigated triazatruxene (TAT) molecules on Ag(111) by low temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Coverages up to one monolayer (ML) were deposited by means of electrospray ionization (ESI) in ultra high vacuum. Sub-monolayer coverages feature the molecules lying flat on the Ag(111) surface with characteristic distances in between them and exhibiting three different types of appearances, possibly due to the interaction with the substrate. By further increasing the coverage they grow in highly ordered structures depending on the density of TAT molecules. STS and time resolved current measurements at individual molecules reveal characteristic excitations beyond a certain threshold energy showing a telegraph noise behaviour with the period depending both on the voltage and the current.