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Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Poster: Nanostructures on Surfaces I

O 49.4: Poster

Tuesday, March 13, 2018, 18:15–20:30, Poster A

Efficient anchoring of molecular end groups via electric field driven chemical reaction — •Tomasz Michnowicz1, Bogdana Borca1,2, Remi Petuya3, Marcel Pristl1, Verena Schendel1, Ivan Pentegov1, Ulrike Kraft1, Hagen Klauk1, Peter Wahl1,4, Andres Arnau3,5, Uta Schlickum1, and Klaus Kern1,61Max Planck Institute for Solid State Research, Germany — 2National Institute of Materials Physics, Romania — 3Donostia International Physics Centre, Spain — 4Unviersity of St Andrews, United Kingdom — 5Basque Country University CSIC-UPV/EHU, Spain — 6Ecole Polytechnique Federale de Lausanne, Switzerland

One of the challenges of single molecule electronics is to form a stable bond of the desired molecule to the metal electrodes, providing low resistance at the molecule-metal interfaces. One of the tools allowing both controlled manipulation of single molecules and probing their properties, including the electric conductance, is Scanning Tunnelling Microscopy (STM). We show that a direct desulfurization reaction of a single thiophene unit embedded in a tetracenothiophene molecule on a Cu (111) surface can be driven by an electric field present in the STM tip-sample junction. This controlled, atomically precise reaction leads to the formation of covalent bonds between two carbon and two copper surface atoms. The enhanced coupling leads to 50% increase of the electric conductance measured by precisely contacting the molecules at the desired atomic positions and forming a molecular bridge between the metallic STM tip electrode and the metallic surface electrode.

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