Dresden 2009 – wissenschaftliches Programm
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.26: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
Transport and noise in organic field effect devices — •Klaus Morawetz1,2, Sibylle Gemming1, Regina Luschtinetz4, Tim Kunze1, Pavel Lipavsky3, Lukas Eng5, and Gotthard Seifert4 — 1Forschungszentrum Dresden-Rossendorf, PF 51 01 19, 01314 Dresden, Germany — 2International Center for Condensed Matter Physics, 70904-910, Brasília-DF, Brazil — 3Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 12116 Prague 2, Czech Republic — 4Institute of Physical Chemistry and Electrochemistry, TU Dresden, 01062 Dresden, Germany — 5Institute of Applied Photophysics, TU Dresden, 01062 Dresden, Germany
The transport and fluctuation properties of organic molecules ordered parallel between two Au contact leads are investigated by the method of surface Green function. From first-principles simulation the relevant hopping parameters are extracted and used to calculate nonlinear transport coefficients with respect to an external bias voltage. A staggering of conductance is found in dependence on the number of molecules squeezed in-between the contacts. The thermal properties show an anomalous behavior whenever the voltage reaches the values of the molecular energy levels active for transport. The thermoelectric figure of merit shows a resonance allowing to reach values even larger than one.