Transition from Direct Tunneling to Field Emission in Metal-Molecule-Metal Junctions
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- 10 July 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 97 (2), 026801
- https://doi.org/10.1103/physrevlett.97.026801
Abstract
Current-voltage measurements of metal-molecule-metal junctions formed from -conjugated thiols exhibit an inflection point on a plot of vs , consistent with a change in transport mechanism from direct tunneling to field emission. The transition voltage was found to scale linearly with the offset in energy between the Au Fermi level and the highest occupied molecular orbital as determined by ultraviolet photoelectron spectroscopy. Asymmetric voltage drops at the two metal-molecule interfaces cause the transition voltage to be dependent on bias polarity.
Keywords
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