Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 44: Scanning Probe Methods I
O 44.7: Talk
Wednesday, March 13, 2013, 12:00–12:15, H33
Passing current through molecular wires of different length — •Norman Fournier1,2, Christian Wagner1,2, Ruslan Temirov1,2, and Stefan Tautz1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich — 2JARA-Fundamentals of Future Information Technology
Recently we developed a method to contact a single molecule on a metal substrate and lift it up with the tip of a combined AFM/STM based on the qPlus sensor [1]. While lifting, we pass the current through the molecule and measure the conductance. The geometry of the junction is controlled by measuring the frequency shift of the qPlus sensor [2].
We applied this method to a set of π-conjugated molecules of different length which all have the same anchoring group. By doing this systematically we probed the transport properties of the wire depending on its length. We also investigated how the transport through the molecule depends on its contacts by using two differnet types of electrodes (Ag and Au).
References
[1] N. Fournier et al. Physical Review B 84, 035435 (2011)
[2] C. Wagner et al. Physical Review Letters 109, 076102 (2012)