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Svatek, Simon A.; Sacchetti, Valentina; Rodríguez-Pérez, Laura; Illescas, Beatriz M.; Rincón-García, Laura; Rubio-Bollinger, Gabino; González, M. Teresa; Bailey, Steven; Lambert, Colin J.; Martín, Nazario; Agraït, Nicolás
Nano letters, 04/2023, Letnik: 23, Številka: 7Journal Article
The thermoelectric properties of molecular junctions consisting of a metal Pt electrode contacting 60fullerene derivatives covalently bound to a graphene electrode have been studied by using a conducting-probe atomic force microscope (c-AFM). The 60fullerene 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 positive or 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 60fullerene derivatives.
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