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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.63: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Tuning the conductance of an unimolecular organic junction — •Bogdana Borca1, Verena Schendel1, Ivan Pentegov1, Ulrike Kraft1, Hagen Klauk1, Peter Wahl1,2, Uta Schlickum1, and Klaus Kern1,3 — 1Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany — 2School of Physics & Astronomy, University of St Andrews, St Andrews, KY16 9SS, UK — 3Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
To improve and realize future molecular based electronic devices, a good understanding of electronic properties at the individual molecular level and possible ways to tune the intrinsic properties of the charge transport through unimolecular junctions are needed. Scanning Tunneling Microscopy and Spectroscopy (STM/STS) represent an ideal tool to characterize and manipulate single atoms and molecules on surfaces. We investigate the behavior of the conductance of pentacene and one of its thioacenes derivatives, thiotetracen, with a low temperature (6.7K) STM. The organic molecules are thermally evaporated under UHV conditions on a clean Cu(111) surface. The submolecular resolution of the STM allows contacting individual molecules at the desired site and measure the flow of the electrical current through this metal-molecular-metal junction. In terms of conductance, a difference is observed between pentacene and the sulfur-containing structure. In addition, the functionalized side of the thiotetracene molecule may be bonded to a metallic adatom or to a molecule, varying the conductance in this way by a gating-like mechanism.