期刊
NANOSCALE
卷 14, 期 16, 页码 6075-6084出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nr00819j
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- French National Research Agency (ANR) [ANR-16-CE05-0029]
- Renatech
- Agence Nationale de la Recherche (ANR) [ANR-16-CE05-0029] Funding Source: Agence Nationale de la Recherche (ANR)
This study investigates the electrical and thermal transport in thin films of a conducting polymer (PEDOT:OTf). The presence of highly conductive nano-domains is revealed by conductive atomic force microscopy (C-AFM). Thermal conductivity in the cross-plane direction is measured by null-point scanning thermal microscopy (NP-SThM). The results show a significant electronic contribution to the thermal transport.
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 the cross-plane direction is measured by null-point scanning thermal microscopy (NP-SThM). PEDOT:OTf indeed demonstrates a 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) to lower 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 (Wiedemann-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. By applying the recently proposed molecular Wiedemann-Franz law, we deduced a reorganization energy of 0.53 +/- 0.06 eV.
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