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Issue 28, 2016
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Identification of a positive-Seebeck-coefficient exohedral fullerene

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If fullerene-based thermoelectricity is to become a viable technology, then fullerenes exhibiting both positive and negative Seebeck coefficients are needed. C60 is known to have a negative Seebeck coefficient and therefore in this paper we address the challenge of identifying a positive-Seebeck-coefficient fullerene. We investigated the thermoelectric properties of single-molecule junctions of the exohedral fullerene C50Cl10 connected to gold electrodes and found that it indeed possesses a positive Seebeck coefficient. Furthermore, in common with C60, the Seebeck coefficient can be increased by placing more than one C50Cl10 in series. For a single C50Cl10, we find S = +8 μV K−1 and for two C50Cl10's in series we find S = +30 μV K−1. We also find that the C50Cl10 monomer and dimer have power factors of 0.5 × 10−5 W m−1 K−2 and 6.0 × 10−5 W m−1 K−2 respectively. These results demonstrate that exohedral fullerenes provide a new class of thermoelectric materials with desirable properties, which complement those of all-carbon fullerenes, thereby enabling the boosting of the thermovoltage in all-fullerene tandem structures.

Graphical abstract: Identification of a positive-Seebeck-coefficient exohedral fullerene

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The article was received on 18 Mar 2016, accepted on 27 Jun 2016 and first published on 27 Jun 2016

Article type: Paper
DOI: 10.1039/C6NR02291J
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Nanoscale, 2016,8, 13597-13602

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    Identification of a positive-Seebeck-coefficient exohedral fullerene

    N. Almutlaq, Q. Al-Galiby, S. Bailey and C. J. Lambert, Nanoscale, 2016, 8, 13597
    DOI: 10.1039/C6NR02291J

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