Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 53: Nanostructures at Surfaces: Other Aspects

O 53.7: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1C

Investigating the switching behaviour of a Tetraphenylmethane-Derivative on Au(111) with STM — •Timo Frauhammer1,2, Lukas Gerhard2, Kevin Edelmann2, Marcin Lindner2, Michal Valasek2, Marcel Mayor2, and Wulf Wulfhekel1,21Physikalisches Insitut, Karlsruhe, Germany — 2Institut für Nanotechnologie, Karlsruhe, Germany

The adsorption and switching behaviour of a Tetraphenylmethane-derivative adsorbed on Au(111) have been studied using scanning tunneling microscopy (STM) at 5.3 K. This derivative consists of a Tetraphenylmethane-core where the four Hydrogen atoms in para-position with respect to the central sp3-Carbon atom are substituted by three Thioacetate-groups and one Triflate-group. The molecules have been deposited on Au(111) from a Dichloromethane solution by using a spray technique. The tip of the STM induces a characteristic switching behaviour between two metastable states. Moreover, Random Telegraph Noise (RTN) can be observed at certain tunneling parameters. The functional dependence of this RTN on bias voltage and tip-sample distance indicates that the switching is induced by the electrical field in the tunnel junction.

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