| 초록 |
The disorder in doped polymers is a critical factor for charge transport as it determines a molecular geometric distortion or electronic coupling which is closely related to polaronic behavior. Therefore, how the disorder affects the charge transport in polymer-dopant systems should be evaluated in microscopic aspect for high thermoelectric (TE) output. We investigate the TE charge transport phenomena of the poly(3,4-ethylenedioxythiophene) (PEDOT) modified by various counter-ions with multi-cyano groups. The result shows distinctly different states in the aspects of crystallinity, charge localization, and energetic disorder depending on their degree of the disorder. Consequently, the PEDOT film with the lowest degree of disorder shows a phenomenal figure-of-merit ZT of 0.21 and high power factor of 630.6 μW·m−1·K−2. This work provides comprehensive understanding of counter-ion-induced disorder effect on charge carrier dynamics in terms of optimizing TE performance. |
