Thermoelectric enhancement in single organic radical molecules

Hurtado-Gallego, Juan, Sangtarash, Sara, Davidson, Ross, Rincón-García, Laura, Daaoub, Abdalghani, Rubio-Bollinger, Gabino, Lambert, Colin J., Oganesyan, Vasily S. ORCID: https://orcid.org/0000-0002-8738-1146, Bryce, Martin R., Agraït, Nicolás and Sadeghi, Hatef (2022) Thermoelectric enhancement in single organic radical molecules. Nano Letters, 22 (3). pp. 948-953. ISSN 1530-6984

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Abstract

Organic thermoelectric materials have potential for wearable heating, cooling, and energy generation devices at room temperature. For this to be technologically viable, high-conductance (G) and high-Seebeck-coefficient (S) materials are needed. For most semiconductors, the increase in S is accompanied by a decrease in G. Here, using a combined experimental and theoretical investigation, we demonstrate that a simultaneous enhancement of S and G can be achieved in single organic radical molecules, thanks to their intrinsic spin state. A counterintuitive quantum interference (QI) effect is also observed in stable Blatter radical molecules, where constructive QI occurs for a meta-connected radical, leading to further enhancement of thermoelectric properties. Compared to an analogous closed-shell molecule, the power factor is enhanced by more than 1 order of magnitude in radicals. These results open a new avenue for the development of organic thermoelectric materials operating at room temperature.

Item Type: Article
Additional Information: Funding Information: H.S. acknowledges the UKRI for Future Leaders Fellowship number MR/S015329/2. S.S. acknowledges the Leverhulme Trust for Early Career Fellowship no. ECF-2018-375. J.H.-G., R.D., L.R.-G., C.J.L, M.R.B., and N.A. acknowledge funding from EC H2020 FET Open project grant agreement number 767187 “QuIET”. M.R.B. thanks EPSRC grant EP/K0394/23/1 and EC H2020 FET Open project grant agreement number 766853 “EFINED” for funding. N.A. and L.R.-G. acknowledge funding from the Education and Research Council of the Comunidad de Madrid and the European Social Fund (ref. PEJD-2019-POST/IND-16353). N.A. and G.R.-B. acknowledge funding from the Comunidad de Madrid NANOMAGCOST-CM (P2018/NMT-4321) and from the Spanish Ministry of Science and Innovation, through grants MAT2017-88693-R and the “María de Maeztu” Programme for Units of Excellence in R&D (CEX2018-000805-M). V.S.O. acknowledges support from EPRSC (Grant EP/P007554/1). Publisher Copyright: © 2022 The Authors. Published by American Chemical Society.
Uncontrolled Keywords: energy harvesting,organic thermoelectricity,quantum transport,single radical molecules,bioengineering,chemistry(all),materials science(all),condensed matter physics,mechanical engineering ,/dk/atira/pure/subjectarea/asjc/1500/1502
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 30 Mar 2022 09:30
Last Modified: 22 Oct 2022 17:39
URI: https://ueaeprints.uea.ac.uk/id/eprint/84344
DOI: 10.1021/acs.nanolett.1c03698

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