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Christian Muller1

1, Chalmers University of Technology, Goteborg, , Sweden

Molecular doping of conjugated polymers is a widely explored tool for the preparation of highly conducting materials for organic thermoelectrics. While doping of thin films is well understood, there is a lack of doping strategies that can be applied to bulk materials. Hence, the up to millimeter thick architectures, which are needed to construct the legs of a thermoelectric generator, are more challenging to realize. In this talk two bulk doping strategies are presented. Foams of poly(3-hexylthiophene) can be sequentially doped without compromise in thermoelectric performance. Further, conjugated polymers with more polar oligo ethylene glycol side chains show improved compatibility with the dopant. As a result, thermally stable p-doped films with a high electrical conductivity of 100 S/cm can be prepared. The same concept is also applicable to n-type polymers, with conductivities reaching 0.3 S/cm.

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