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Long-range electron tunnelling in oligo-porphyrin molecular wires

Sedghi, Gita, García-Suárez, Víctor M., Esdaile, Louisa J., Anderson, Harry L., Lambert, Colin J., Martín, Santiago, Bethell, Donald, Higgins, Simon J., Elliott, Martin, Bennett, Neil, Macdonald, John Emyr and Nichols, Richard J. 2011. Long-range electron tunnelling in oligo-porphyrin molecular wires. Nature Nanotechnology 6 (8) , pp. 517-523. 10.1038/nnano.2011.111

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Short chains of porphyrin molecules can mediate electron transport over distances as long as 5–10 nm with low attenuation. This means that porphyrin-based molecular wires could be useful in nanoelectronic and photovoltaic devices, but the mechanisms responsible for charge transport in single oligo-porphyrin wires have not yet been established. Here, based on electrical measurements of single-molecule junctions, we show that the conductance of the oligo-porphyrin wires has a strong dependence on temperature, and a weak dependence on the length of the wire. Although it is widely accepted that such behaviour is a signature of a thermally assisted incoherent (hopping) mechanism, density functional theory calculations and an accompanying analytical model strongly suggest that the observed temperature and length dependence is consistent with phase-coherent tunnelling through the whole molecular junction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Electronic properties and devices
Publisher: Nature Publishing Group
ISSN: 1748-3387
Last Modified: 04 Jun 2017 03:08

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