Regensburg 2007 – wissenschaftliches Programm

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 7: Single Molecule Contacts

SYOE 7.3: Vortrag

Dienstag, 27. März 2007, 17:30–17:45, H32

High-Aspect Ratio Nanogap Electrodes for Averaging Molecular Conductance Measurements — Sebastian Markus Luber¹, Fan Zhang¹, Simone Lingitz¹, Allan Glargaard Hansen¹, Felix Scheliga², Emma Thorn-Csányi², Max Bichler¹, and •Marc Tornow^3,1 — ¹Walter Schottky Institut, TU München, Germany — ²Technische und Makromolekulare Chemie, Universität Hamburg, Germany — ³Institut für Halbleitertechnik, TU Braunschweig, Germany

We present a method to fabricate a pair of closely spaced metal electrodes on the cleaved plane of a GaAs/AlGaAs heterostructure grown by Molecular Beam Epitaxy (MBE). These smooth, co-planar electrodes oppose each other in a predetermined distance of a few nanometers, continuously over their entire width of tens of microns. We propose this structure for the determination of the average electrical conductance of molecules. As test system, we measured the current-voltage characteristics of 8.5 nm long Oligo-(p-phenylenevinylene) molecules assembled across electrode pairs of separation 8 +/- 2 nm and width 30 µm. The observed non-linear I-V characteristics are in good qualitative agreement with model calculations.