Journal
NATURE NANOTECHNOLOGY
Volume 6, Issue 8, Pages 517-523Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2011.111
Keywords
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/D07665X/1, EP/D076552/1, GR/S84064/01]
- QinetiQ
- Department of Trade and Industry
- Royal Society
- Northwest Regional Development Agency
- Engineering and Physical Sciences Research Council [EP/D076072/1, EP/D07665X/1, EP/D076552/1] Funding Source: researchfish
- EPSRC [EP/D07665X/1, EP/D076552/1, EP/D076072/1] Funding Source: UKRI
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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.
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