Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Metal substrates: Adsorption of organic / bio molecules I
O 7.5: Vortrag
Montag, 26. März 2012, 11:30–11:45, A 053
Force-controlled lifting of molecular wires — •Norman Fournier1,2, Christian Wagner1,2, Christian Weiss1,2, Ruslan Temirov1,2, and F. Stefan Tautz1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology
Understanding of the charge transport on a single-molecule level is vital for the future success of molecular electronics. Often, however, this understanding is hindered by the lack of data obtained under well-controlled experimental conditions. Recently, we have shown that a low-temperature dynamic atomic force microscope (AFM) can be used to perform well-controlled and tunable single molecule transport studies [1]. In this experiment a single 3,4,9,10-perylene-tetracarboxylicacid-dianhydride (PTCDA) molecule is lifted from a metal surface, while the stiffness of the junction is recorded along with the conductivity. Here, we compare lifting of PTCDA from Au(111) and from Ag(111), i.e., two situations where PTCDA is either connected to gold or to silver electrodes. We find clear differences in the conductivity and the stiffness in both cases that we attribute to the different character of the molecule-metal bond.
[1] N. Fournier et al. Phys. Rev. B 84, 035435 (2011)