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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.; Bryce, Martin R.; Agraït, Nicolás; Sadeghi, Hatef

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Authors

Juan Hurtado-Gallego

Sara Sangtarash

Laura Rincón-García

Abdalghani Daaoub

Gabino Rubio-Bollinger

Colin J. Lambert

Vasily S. Oganesyan

Nicolás Agraït

Hatef Sadeghi



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.

Citation

Hurtado-Gallego, J., Sangtarash, S., Davidson, R., Rincón-García, L., Daaoub, A., Rubio-Bollinger, G., …Sadeghi, H. (2022). Thermoelectric Enhancement in Single Organic Radical Molecules. Nano Letters, 22(3), https://doi.org/10.1021/acs.nanolett.1c03698

Journal Article Type Article
Online Publication Date Jan 24, 2022
Publication Date 2022
Deposit Date May 16, 2022
Publicly Available Date May 16, 2022
Journal Nano Letters
Print ISSN 1530-6984
Electronic ISSN 1530-6992
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 22
Issue 3
DOI https://doi.org/10.1021/acs.nanolett.1c03698

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