Title:
Structural Alternation Correlated to the Conductivity Enhancement of PEDOT:PSS Films by Secondary Doping
Authors:
K. Itoh, Y. Kato, Y. Honma, H. Masunaga, A. Fujiwara, S. Iguchi, and T. Sasaki
Abstract:
“Secondary doping” in poly(3,4-ethylenedioxythiophene):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.
Link:
J. Phys. Chem. C 123 (2019) 13467 – 13471.
DOI: 10.1021/acs.jpcc.9b02475