Dresden 2009 – scientific programme

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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

Thursday, March 26, 2009, 16:30–19:00, P1A

Transport and noise in organic field effect devices — •Klaus Morawetz^1,2, 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.