Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.15: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
Dynamic control of STM-induced luminescence by a single molecule — Christoph Große1, Alexander Kabakchiev1, Theresa Lutz1, Romain Froidevaux1,4, Frank Schramm2, Mario Ruben2,3, Markus Etzkorn1, Uta Schlickum1, •Klaus Kuhnke1, and Klaus Kern1,4 — 1Max Planck Institut für Festkörperforschung, Stuttgart, Germany — 2Karlsruhe Institut für Technologie, Eggenstein-Leopoldshafen, Germany — 3Université de Strasbourg, Strasbourg, France — 4Ecole Polytechnique Fédérale de Lausanne, Switzerland
The electronic states of a molecule in a double tunnel junction can control the plasmonic light emission. We locate a single Ir(ppy)3 molecule adsorbed on a fullerene bilayer within the tunnel junction between metallic substrate and metallic tip of a low temperature (4K) ultra high vacuum scanning tunneling microscope. Using the ability to precisely control charging and discharging of the molecule, we demonstrate the gating of plasmonic luminescence. Two mechanisms contribute to the gating: A local one is due to the bias-controlled onset of tunnel current passing through the molecular electronic state. A second, non-local one, is due to the extended band bending in the fullerene layer in proximity to the charged molecule. We measure the delay between bias voltage pulses and light pulses and find a charge transfer time below one nanosecond. The double tunnel junction can be operated as a fast plasmon-emitting field-effect transistor with the molecule fulfilling the transistor function. The luminescence on/off ratio is of several orders of magnitude for a bias amplitude of only a few mV.