Enhanced Thermoelectricity in Metal-[60]Fullerene-Graphene Molecular Junctions.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36970777.
- Also identified by DOI 10.1021/acs.nanolett.3c00014 and PMC identifier 10103166.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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 <i>meta</i>-connected phenyl rings, two <i>para</i>-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-C<sub>60</sub>-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 [60]fullerene derivatives.