Significant electronic thermal transport in the conducting polymer poly(3,4-ethylenedioxythiophene)

Abstract

Suspended microdevices are employed to measure the in-plane electrical conductivity, thermal conductivity, and Seebeck coefficient of suspended poly(3,4-ethylenedioxythiophene) (PEDOT) thin films. The measured thermal conductivity is higher than previously reported for PEDOT and generally increases with the electrical conductivity. The increase exceeds that predicted by the Wiedemann-Franz law for metals and can be explained by significant electronic thermal transport in PEDOT.

Keywords: Wiedemann-Franz law; conducting polymers; poly(3,4-ethylenedioxythiophene); thermal conductivity; thermoelectric materials.