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arXiv · 1909.09321

Structural Alternation Correlated to the Conductivity Enhancement of PEDOT:PSS Films by Secondary Doping

K. Itoh·Y. Kato·Y. Honma·H. Masunaga·A. Fujiwara·S. Iguchi·T. Sasaki
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Abstract

"Secondary doping" in poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (PEDOT:PSS) is quite effective and a frequently used method for the conductivity enhancement. This simple approach, the addition of co-solvents to the PEDOT:PSS solution before film fabrication, is an essential way to derive the high electrical performance of PEDOT:PSS, but the mechanism still remains unclear. In this study, nanoscale structural changes synchronized with the conductivity enhancement via secondary doping in PEDOT:PSS films were investigated. During secondary doping with ethylene glycol near the critical dopant concentration, non-crystalized PEDOT molecules uncoupled from PSS chains and then underwent nano-crystallization. These structural changes might be the key driving force for conductivity enhancement via secondary doping.

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K. Itoh, Y. Kato, Y. Honma, H. Masunaga, A. Fujiwara, S. Iguchi, T. Sasaki. 2019-09-20. Structural Alternation Correlated to the Conductivity Enhancement of PEDOT:PSS Films by Secondary Doping. https://doi.org/10.1021/acs.jpcc.9b02475

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