Improvement of Thermoelectric Performance of PEDOT by Controlling Counter-Ion-Induced-Disorder
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초록
내용
In this work, we quantified the structural and energetic disorder caused by counter–ions in poly(3,4-ethylenedioxythiophene) (PEDOT), and investigated how the disorder affects charge transport in thermoelectric generators (TEGs). Different counter-ions localized charge carriers differently, and therefore changed the degree of disorder in PEDOT. These changes affected in several qualities, including crystallinity, polaron behaviors, and density of states (DOS) of the PEDOT. The localization of charge carriers in PEDOT that had a high degree of disorder changed the PEDOT planarity, the characteristics of polarons, and the broadness of DOS. These changes resulted in opposite behaviors in the electrical conductivity and the Seebeck coefficient in PEDOT in response to the extent of disorder, and thereby yielded a high figure of merit ZT of 0.21 in PEDOT that had the lowest degrees of the disorder.