Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)
O 41.42: Poster
Dienstag, 23. März 2010, 18:30–21:00, Poster B1
Tuning and Guiding Electron Current through Ag-SnPc-Ag Junctions — •Yongfeng Wang1, Jörg Kröger1, Richard Berndt1, Héctor Vázquez2, Mads Brandbyge2 und Magnus Paulsson3 — 1Institut für Experimentelle und Angewandte Physik,Christian-Albrechts-Universität zu Kiel,D-24098 Kiel,Germany — 2Department of Micro and Nanotechnology, NanoDTU, Technical University of Denmark, DK-2800 Kongens Lyngby , Denmark — 3Department of Physics, Kalmar University, Sweden
The transport of electrons through molecules is relevant for processes in many branches of science and has found applications in electrical engineering. Nevertheless, the understanding and, in particular, control of electron flow through metal-molecule-metal junctions on a (sub-)nanometre scale are still incomplete. Here, we report on guided electron transport through tin phthalocyanine (SnPc) contacted by silver electrodes, the tip of a cryogenic scanning tunneling microscope and a Ag(111) single crystal. By systematically modifying molecular orientations, molecule-substrate interactions, and the electrode atomic structure, the electron conductance of Ag-SnPc-Ag junctions is tuned from 1 to 25 microsiemens. Moreover, current flow through these junctions is directionally guided as visualized by supporting nonequilibrium Green's function calculations. Funding by the Deutsche Forschungsgemeinschaft through SFB 677 is acknowledged.