Self-doped PEDOT-based polymers for thermoelectric applications

Published : 15 July 2019

Organic materials are promising for the heat conversion into electricity from low temperature sources (typ. < 200°C). Compared to inorganic materials (Bi2Te3), organic materials have several advantages: light-weight, flexibility, abundance, low cost, easily processable over large areas, and whose electronic properties can be tuned thanks to chemistry. The development of organic materials for thermoelectric applications started in the early 2010’s. It quickly appeared that the control of doping is crucial to ensure a high thermoelectric power.

Based on the expertise of the Liten laboratory on the poly-(3,4-ethylene dioxythiophene) (poly-EDOT or PEDOT) already used for thermoelectric applications [1], we propose a new approach to efficiently control the doping of these materials by alternating undoped ‘EDOT’ monomers, shorten as ‘M’, and ‘fonctionnalized (doped) EDOT’ monomers, shorten as ‘F’. The doping rate control will be ensure through the polymerization of different synthons (building blocks): [F]n (doping rate 1:1), [M-F-M]n (doping rate 1:3) et [M-M-F-M-M]n (doping rate 1:5).

The electronic transport properties of these new materials will be studied at the STEP laboratory of INAC, which has a long-standing expertise in conductivity and transport mechanisms as a function of temperature. In particular, the impact of the level of doping on the thermoelectric properties will be studied in the range [80K; 500K] with the new LINSEIS Thin Film Analyser available at our laboratory.

References :

[1] N. Massonnet et al., Journal of Materials Chemistry C, 2014 2 (7), pp. 1278-1283

[2] N. Massonnet et al., Chemical Science, 2015 6 (1), pp. 412-417

[3] M. Gueye et al., Chem. Mater., 2016, 28 (10), pp 3462–3468

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