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 ORCID: https://orcid.org/0000-0002-9254-9898, Bennett, Neil, Macdonald, John Emyr ORCID: https://orcid.org/0000-0001-5504-1692 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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Abstract

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:	18 Oct 2022 14:23
URI:	https://orca.cardiff.ac.uk/id/eprint/17274

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