Thermoelectric Enhancement in Single Organic Radical Molecules

Hurtado-Gallego, J. and Sangtarash, S. and Davidson, R. and Rincón-García, L. and Daaoub, A. and Rubio-Bollinger, G. and Lambert, C.J. and Oganesyan, V.S. and Bryce, M.R. and Agraït, N. and Sadeghi, H. (2022) Thermoelectric Enhancement in Single Organic Radical Molecules. Nano Letters, 22 (3). pp. 948-953. ISSN 1530-6984

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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.

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Journal Article
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Nano Letters
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Deposited On:
24 Feb 2022 09:25
Last Modified:
22 Nov 2022 11:09