Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 27: Organic/bio Molecules on Metal Surfaces III

O 27.9: Talk

Tuesday, April 1, 2014, 12:30–12:45, TRE Phy

Resonant tunnelling observed in metal-PTCDA-metal junction — •Matthew Green, Alexander Grötsch, Ruslan Temirov, and Stefan Tautz — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany

Understanding of charge transport in single molecule junctions is of fundamental importance, especially for future molecular electronics applications. Single molecules have been shown to conduct electric current, but there is relatively little understanding of the precise charge transport mechanisms responsible for conductance in single molecule junctions. Here we describe a new insight into quantum transport through a single PTCDA molecule suspended between two metal electrodes, namely an atomically clean metal surface and the tip of a combined NC-AFM/STM [1][2]. We are able to probe transport characteristics across a wide range of applied bias voltages. In particular, resonant tunnelling through the lowest unoccupied molecular orbital is observed. Our findings open up the possibility to a more detailed understanding of different charge transport regimes present in single molecule junctions.

[1] N. Fournier et al., Phys. Rev. B 84(3) 035435 (2011)

[2] C. Wagner et al., Phys. Rev. Lett. 109(7) 076102 (2012)