Enhanced Thermoelectricity in Metal–[60]Fullerene–Graphene Molecular Junctions
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2023
Authors
Svatek, Simon
Sacchetti, Valentina
Rincón-García, Laura
Rubio-Bollinger, Gabino
González, Maria Teresa
Bailey, Steven
Lambert, Colin
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American Chemical Society
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Simon A. Svatek, Valentina Sacchetti, Laura Rodríguez-Pérez, Beatriz M. Illescas, Laura Rincón-García, Gabino Rubio-Bollinger, M. Teresa González, Steven Bailey, Colin J. Lambert, Nazario Martín, and Nicolás Agraït
Nano Letters 2023 23 (7), 2726-2732
DOI: 10.1021/acs.nanolett.3c00014
Abstract
The thermoelectric properties of molecular junctions consisting of a metal Pt electrode contacting [60]fullerene derivatives covalently bound to a graphene electrode have been studied by using a conducting-probe atomic force microscope (c-AFM). The [60]fullerene derivatives are covalently linked to the graphene via two meta-connected phenyl rings, two para-connected phenyl rings, or a single phenyl ring.We find that the magnitude of the Seebeck coefficient is up to nine times larger than that of Au−C60−Pt molecular junctions.Moreover,the sign of the thermopower can be either positiveor negative depending on the details of the binding geometry and on the local value of the Fermi energy. Our results demonstrate the potential of using graphene electrodes for controlling and enhancing the thermoelectric properties of molecular junctions and confirm the outstanding performance of [60]fullerene derivatives.