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Field-effect control of graphene–fullerene thermoelectric nanodevices

Field-effect control of graphene–fullerene thermoelectric nanodevices

Gehring, Pascal ORCID: 0000-0002-7073-9922, Harzheim, Achim, Spièce, Jean, Sheng, Yuewen, Rogers, Gregory, Evangeli, Charalambos, Mishra, Aadarsh, Robinson, Benjamin J. ORCID: 0000-0001-8676-6469, Porfyrakis, Kyriakos ORCID: 0000-0003-1364-0261, Warner, Jamie H. ORCID: 0000-0002-1271-2019, Kolosov, Oleg V. ORCID: 0000-0003-3278-9643, Briggs, G. Andrew D. and Mol, Jan A. ORCID: 0000-0003-0411-2598 (2017) Field-effect control of graphene–fullerene thermoelectric nanodevices. Nano Letters, 17 (11). pp. 7055-7061. ISSN 1530-6984 (Print), 1530-6992 (Online) (doi:https://doi.org/10.1021/acs.nanolett.7b03736)

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Abstract

Although it was demonstrated that discrete molecular levels determine the sign and mag nitude of the thermoelectric effect in single-molecule junctions, full electrostatic control of these levels has not been achieved to date. Here, we show that graphene nanogaps combined with gold micro-heaters serve as a testbed for studying single-molecule their moelectricity. Reduced screening of the gate electric field compared to conventional metal electrodes allows controlling the position of the dominant transport orbital by hundreds of meV. We find that the power factor of graphene-fullerene junctions can be tuned over several orders of magnitude to a value close to the theoretical limit of an isolated Breit-Wigner resonance. Furthermore our data suggests that the power factor of isolated level is only given by the tunnel coupling to the leads and temperature. These results open up new avenues for exploring thermoelectricity and charge transport in individual molecules, and highlight the importance of level-alignment and coupling to the electrodes for optimum energy-conversion in organic thermoelectric materials.

Item Type: Article
Uncontrolled Keywords: electroburning, graphene, single molecule, thermoelectrics, molecular thermopower, molecular conductance
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > School of Engineering (ENN)
Last Modified: 23 Oct 2019 11:11
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/25770

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