Observation of anomalously large Nernst effects in conducting polymers

Yingqiao Ma, Xinglong Ren, Ye Zou (), Wenrui Zhao, Dongyang Wang, Zhen Ji, Juncheng Fan, Chaoyi Yan, Lanyi Xiang, Gaoyang Ge, Xiaojuan Dai, Fengjiao Zhang, Ting Lei, Henning Sirringhaus (), Chong-an Di () and Daoben Zhu
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Yingqiao Ma: Chinese Academy of Sciences
Xinglong Ren: JJ Thomson Avenue
Ye Zou: Chinese Academy of Sciences
Wenrui Zhao: Chinese Academy of Sciences
Dongyang Wang: Chinese Academy of Sciences
Zhen Ji: Chinese Academy of Sciences
Juncheng Fan: JJ Thomson Avenue
Chaoyi Yan: University of Chinese Academy of Sciences
Lanyi Xiang: University of Chinese Academy of Sciences
Gaoyang Ge: Peking University
Xiaojuan Dai: Chinese Academy of Sciences
Fengjiao Zhang: University of Chinese Academy of Sciences
Ting Lei: Peking University
Henning Sirringhaus: JJ Thomson Avenue
Chong-an Di: Chinese Academy of Sciences
Daoben Zhu: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract As a fundamental thermoelectric phenomenon in many solid-state materials, the Nernst effect has yet to be observed in conducting polymers. This knowledge could provide important insight into their elusive mechanism, which are crucial for flexible optoelectronic and thermoelectric applications. However, within the Landau’s Fermi-liquid picture, the Nernst coefficient has demonstrated to be proportional to the charge mobility, and thus should be negligible in less ordered polymers with inherent low mobility. Here, we challenge this notion by observing an anomalously large Nernst effect in a range of conducting polymers. Specially, the Nernst coefficients in these doped polymers exceed the Fermi-liquid predictions by 2-3 orders of magnitudes with negative mobility dependence. These intriguing observations are attributed to the intrinsic quasi-one-dimensional transport nature in conjugated polymers and their unique chemical doping mechanism. Our research not only provides experimental insights into the non-Fermi-liquid charge transport nature of polymers, but also suggests its universality for other quasi-one-dimensional materials and/or less ordered systems, and opens up exciting possibilities for developing transverse organic thermoelectric applications.

Date: 2025
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DOI: 10.1038/s41467-025-55976-x

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