Journal
NANO LETTERS
Volume 23, Issue 23, Pages 10719-10724Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.3c02569
Keywords
molecular electronics; metallo-organic radicals; spin transport; phonon transport; molecular thermoelectricity; mechanosensitivity
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Organic materials have potential for thermoelectric applications, and their electrical conductance and Seebeck coefficient can be mechanically tuned to enhance their performance.
Organic materials are promising candidates for thermoelectric cooling and energy harvesting at room temperature. However, their electrical conductance (G) and Seebeck coefficient (S) need to be improved to make them technologically competitive. Therefore, radically new strategies need to be developed to tune their thermoelectric properties. Here, we demonstrate that G and S can be tuned mechanically in paramagnetic metallocenes, and their thermoelectric properties can be significantly enhanced by the application of mechanical forces. With a 2% junction compression, the full thermoelectric figure of merit is enhanced by more than 200 times. We demonstrate that this is because spin transport resonances in paramagnetic metallocenes are strongly sensitive to the interaction between organic ligands and the metal center, which is not the case in their diamagnetic analogue. These results open a new avenue for the development of organic thermoelectric materials for cooling future quantum computers and generating electricity from low-grade energy sources.
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