Upon adding 3% ethylene glycol (EG), the electrical conductivity of poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) at room temperature significantly increased from 3 to 175 S cm−1, while a further increase in EG up to 20% resulted in a decrease in the electrical conductivity to 117 S cm−1. It was found that the improvement in the electrical conductivity could be explained from the changes in the hierarchical structure: a decrease in the insulating PSS shell, crystallization of the PEDOT, and aggregation of the PEDOT/PSS particles, which affected both the intra- and interparticle transport of charge carriers.
- Tatsuhiro Horii
- Yuechen Li
- Hidenori Okuzaki
