Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 27: Nanoelektronik III: Molekulare Elektronik
TT 27.3: Vortrag
Donnerstag, 11. März 2004, 10:15–10:30, H19
Electronic Transport through C60 — •Tobias Böhler, Jochen Gebing, and Elke Scheer — FB Physik - Universität Konstanz
We present an experiment to measure the differential conductance of a single or few C60 molecules embedded in between the single atom tips of a mechanically controllable break junction (MCB). The C60 is evaporated onto an opened break junction under high vacuum conditions. Then I-V-curves are taken at room temperature. The tip electrodes of the MCB are fabricated of aluminium or gold.
The I-V-curves are linear for voltages |U|≤0.2V and show slowly increasing conductance for higher voltages with time dependent fluctuations. After the evaporation of C60 the fluctuations are suppressed, but the nonlinearities of the I-V-curves remain unaffected. Thus, it appears that the C60 molecules stabilize the gold contact across which a maximum voltage of 1V can be applied.
Another method is the fabrication of a MCB made of C60 without metallic electrodes by evaporating the molecules onto a lithographic mask. The conductance of the junction is much smaller (≈ 150 MΩ) with similar nonlinear I-V-curves for larger voltages.