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Article Dans Une Revue Journal of Materials Chemistry C Année : 2021

PEDOT:Tos electronic and thermoelectric properties: lessons from two polymerization processes

Résumé

In the landscape of π-conjugated polymers, poly(3,4-ethylenedioxythiophene) doped with iron(III) p-toluenesulfonate (PEDOT:Tos) has shown promise as a thermoelectric material for near room temperature applications. Such properties are inherent to its semi-metallic nature when optimally doped leading to high electrical conductivity and a relatively good Seebeck coefficient. Nevertheless, the final thermoelectric properties of PEDOT:Tos are highly influenced by the polymerization pathways and a thorough understanding of the interplay between polymerization processes and thermoelectric properties is needed. Here, PEDOT:Tos thin films with a doping level of 22 ± 2% were produced by in situ polymerization and vapor-phase polymerization and a comparative study was performed in order to investigate the subtle correlations between morphological features and electronic signatures for both types of samples. Accordingly, optimized in situ polymerized PEDOT:Tos films were demonstrated to exhibit higher electrical conductivities (up to 4398 ± 68 S cm−1) and power factors (up to 148 ± 37 μW m−1 K−2), highlighting the importance of the polymerization process on the final thermoelectric properties.

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Dates et versions

hal-03737492 , version 1 (25-07-2022)

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Solène Perrot, Florent Pawula, Stanislav Péchev, Georges Hadziioannou, Guillaume Fleury. PEDOT:Tos electronic and thermoelectric properties: lessons from two polymerization processes. Journal of Materials Chemistry C, 2021, 9 (23), pp.7417-7425. ⟨10.1039/D1TC00756D⟩. ⟨hal-03737492⟩
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