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
|
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: | 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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