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Controlling Electrostatic Interaction in PEDOT:PSS to Overcome Thermoelectric Tradeoff Relation
Author(s) -
Ju Duckhyun,
Kim Daegun,
Yook Hyunwoo,
Han Jeong Woo,
Cho Kilwon
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201905590
Subject(s) - materials science , seebeck coefficient , polystyrene sulfonate , thermoelectric effect , power factor , pedot:pss , dopant , conductive polymer , electrical resistivity and conductivity , thermoelectric materials , figure of merit , polymer , condensed matter physics , doping , chemical physics , optoelectronics , power (physics) , thermodynamics , composite material , thermal conductivity , electrical engineering , physics , engineering
A high power factor must be achieved to improve the thermoelectric (TE) output of organic TE materials though the tradeoff between electrical conductivity and the Seebeck coefficient is a serious obstacle to the further development of these materials. Here, systematic control of the electrostatic interaction between a conducting polymer and a dopant induces a positive deviation from this TE tradeoff relation so that the electrical conductivity and the Seebeck coefficient simultaneously increase. Upon reduction of the electrostatic interaction, substantial changes in the film morphology, chain conformation, and crystalline ordering are observed, all of which critically affect the TE charge transport. As a result, the electrostatic interaction control is found to be an effective strategy to enhance the power factor, overcoming the tradeoff between TE parameters. Adapting this strategy to poly(3,4‐ethylenedioxythiophene):polystyrene‐sulfonate results in a remarkable power factor (=700.2 µW m −1 K −2 ) and figure of merit ZT (=0.25).