Abstract
The impedance behavior of semiconducting polymer film electrodes based on poly(3,4-ethylenedioxythiophene) (PEDOT) in combination with a series of anionic dopants has been investigated using electrochemical impedance spectroscopy (EIS) over the frequency range from 0.1 Hz to 100 kHz. Films were electrodeposited on gold-coated Pt wire electrodes from a nonaqueous solution containing 3,4-ethylenedioxythiophene (EDOT). EIS results reveal that, under the optimal synthesis conditions, PEDOT electrodes consistently exhibit low, frequency-independent impedance over a wide frequency range (from ∼10 Hz to 100 kHz). These results suggest that the behavior originates from the two-layer homogeneous morphology of the film. A model for conduction in the films that is supported by experimental evidence is proposed, and EIS data for electrodes produced under a variety of electropolymerization conditions are presented.
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