A physical interpretation of impedance at conducting polymer/electrolyte junctions

作者：Stavrinidou Eleni; Sessolo Michele; Winther Jensen Bjorn; Sanaur Sebastien; Malliaras George G^*

来源：AIP Advances, 2014, 4(1): 017127.

DOI：10.1063/1.4863297

We monitor the process of dedoping in a planar junction between an electrolyte and a conducting polymer using electrochemical impedance spectroscopy performed during moving front measurements. The impedance spectra are consistent with an equivalent circuit of a time varying resistor in parallel with a capacitor. We show that the resistor corresponds to ion transport in the dedoped region of the film, and can be quantitatively described using ion density and drift mobility obtained from the moving front measurements. The capacitor, on the other hand, does not depend on time and is associated with charge separation at the moving front. This work offers a physical description of the impedance of conducting polymer/electrolyte interfaces based on materials parameters.

• 出版日期2014-1