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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 7: Single Molecule Contacts
SYOE 7.3: Talk
Tuesday, March 27, 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 Tornow3,1 — 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.