Thermal and electrical cross-plane conductivity at the nanoscale in poly(3,4-ethylenedioxythiophene):trifluoromethanesulfonate thin films

Autor: Kirill Kondratenko, David Guérin, Xavier Wallart, Stéphane Lenfant, Dominique Vuillaume
Přispěvatelé: Nanostructures, nanoComponents & Molecules - IEMN (NCM - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Centrale de Micro Nano Fabrication - IEMN (CMNF - IEMN), EPItaxie et PHYsique des hétérostructures - IEMN (EPIPHY - IEMN), We thank the financial support from French National Research Agency (ANR): project HARVESTERS, ANR-16-CE05-0029. The IEMN facilities are partly supported by Renatech. We thank D. Deresmes for his valuable help with the SThM instrument, Renatech Network, PCMP PCP, ANR-16-CE05-0029,Harvesters,Récuperer l'energie thermique de l'environnement à l'aide d'un générateur thermoélectrique polymère pour alimenter un capteur autonome(2016)
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Nanoscale
Nanoscale, 2022, 14 (16), pp.6075-6084. ⟨10.1039/D2NR00819J⟩
ISSN: 2040-3364
2040-3372
DOI: 10.1039/D2NR00819J⟩
Popis: International audience; Cross-plane electrical and thermal transport in thin films of a conducting polymer (poly(3,4-ethylenedioxythiophene), PEDOT) stabilized with trifluoromethanesulfonate (OTf) is investigated in this study. We explore their electrical properties by conductive atomic force microscopy (C-AFM), which reveals the presence of highly conductive nano-domains. Thermal conductivity in cross-plane direction is measured with Null-Point scanning thermal microscopy (NP-SThM): PEDOT:OTf indeed demonstrates non-negligible electronic contribution to the thermal transport. We further investigate the correlation between electrical and thermal conductivity by applying post-treatment: chemical reduction (de-doping) for the purpose of lowering charge carrier concentration and hence, electrical conductivity and acid treatment (over-doping) to increase the latter. From our measurements, we find a vibrational thermal conductivity of 0.34±0.04 W m-1 K-1. From the linear dependence or the electronic contribution of thermal conductivity vs. the electronic conductivity (Widemann-Franz law), we infer a Lorenz number 6 times larger than the classical Sommerfeld value as also observed in many organic materials for in-plane thermal transport. Applying the recently proposed molecular Widemann-Franz law, we deduced a reorganization energy of 0.53±0.06 eV
Databáze: OpenAIRE
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