DOI: https://doi.org/10.29363/nanoge.inform.2019.052
Publication date: 8th January 2019
Conducting polymers have gained the rising attention of the scientific community, due to their thermoelectric efficiencies that enable the design of room temperature flexible heat harvesters, that can potentially cover the energy demands of the nomadic modern society. Their thermoelectric efficiency is usually optimized by tuning their oxidation levels, considering though, that the Seebeck coefficient (S) is decreasing with the electrical conductivity (σ), as both are antagonistically related to the carrier concentration. In this work we present a concurrent increase of S and σ and we experimentally derive the dependence of Seebeck coefficient on charge carrier mobility, for the first time in organic electronics. Through detailed control of the polymer synthesis, we enabled the formation of a more dense percolation path that facilitated the charge transport and the thermodiffusion of the charge carriers inside the conducting polymer, while the material shifted from a fermi glass to a semimetal, as its crystallinity increased. With our work not only we provide a solid understanding on the origin of the thermoelectric properties of conducting polymers, but we also highlight the importance of enhanced charge carrier mobility for the design of efficient thermoelectric polymers.
The author acknowledges the following team members of the present work: I. Petsagkourakis ,G. Prunet, S.Perrot, G. Fleury, A . S h a r m a S. Dilhaire, S. Grauby (Univ. Bordeaux), E. Pavlopoulou (ENSCBP Bordeaux), G. Portale (Univ. Groningen), M. Fahlman, X. Crispin, M. Berggren (Univ. Linköping).
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