Unravelling the interplay between electronic transport and phonon dynamics in organic thermoelectric materials
Thermoelectric organic or hybrid materials are considered as very promising alternative to inorganic semiconductors for recovering energy from heat sources below 100°C. Among them, the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) is one of the most promising. We have recently optimized its electronic conductivity and thermoelectric properties via structure and dopant engineering. We reached the highest electrical conductivities (> 5000 S.cm-1) ever reported for a PEDOT thin film. At this stage of our study, we need to understand the interplay between the phonon modes and the electronic transport, which is basically unknown in such systems. Therefore we propose to investigate the dynamical properties by QENS over the temperature range of interest (150-400K), with the aim of establishing (or not) the relation between composition (hence, nanostructure, in particular crystalline vs amorphous domains), phonons (or, more generally, dynamics) and performance.
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DEMADRILLE RENAUD; Olivier BARDAGOT; CARELLA Alexandre; DJURADO David; GUEYE Magatte Niang; LYONNARD Sandrine; OLLIVIER Jacques and SCHULTHEISS Amelie. (2018). Unravelling the interplay between electronic transport and phonon dynamics in organic thermoelectric materials. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-464
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