Subdiffusion behavior in poly(3,4-ethylenedioxythiophene): Polystyrene sulfonate (PEDOT:PSS) evidenced by electrochemical impedance spectroscopy

We have obtained impedance measurements of PEDOT:PSS films and propose a novel interpretation for electrical charge transport mechanisms in the polymer. A parabolic subdiffusion model produced excellent fitting for the impedance data, suggesting that anomalous ion diffusion limits charge transfer through the nanoporous film.

► Impedance measurements of PEDOT:PSS films were obtained.
► The impedance data were interpreted by anomalous diffusion theory.
► A parabolic subdiffusion model explained the experimental impedance values.
► The anomalous ion diffusion limits charge transfer through the nanoporous film.