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Issue 16, 2017
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High-performance thermoelectricity in edge-over-edge zinc-porphyrin molecular wires

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Abstract

If high efficiency organic thermoelectric materials could be identified, then these would open the way to a range of energy harvesting technologies and Peltier coolers using flexible and transparent thin-film materials. We have compared the thermoelectric properties of three zinc porphyrin (ZnP) dimers and a ZnP monomer and found that the “edge-over-edge” dimer formed from stacked ZnP rings possesses a high electrical conductance, negligible phonon thermal conductance and a high Seebeck coefficient of the order of 300 μV K−1. These combine to yield a predicted room-temperature figure of merit of ZT ≈ 4, which is the highest room-temperature ZT ever reported for a single organic molecule. This high value of ZT is a consequence of the low phonon thermal conductance arising from the stacked nature of the porphyrin rings, which hinders phonon transport through the edge-over-edge molecule and enhances the Seebeck coefficient.

Graphical abstract: High-performance thermoelectricity in edge-over-edge zinc-porphyrin molecular wires

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Publication details

The article was received on 12 Dec 2016, accepted on 23 Mar 2017 and first published on 31 Mar 2017


Article type: Paper
DOI: 10.1039/C6NR09598D
Citation: Nanoscale, 2017,9, 5299-5304
  • Open access: Creative Commons BY license
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    High-performance thermoelectricity in edge-over-edge zinc-porphyrin molecular wires

    M. Noori, H. Sadeghi and C. J. Lambert, Nanoscale, 2017, 9, 5299
    DOI: 10.1039/C6NR09598D

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