The well-known enhanced conductivity of poly(3,4-ethylenedioxythiophene): poly(4-styrenesulfonate) (PEDOT:PSS) thin films that is obtained by addition of high-boiling solvents like sorbitol to the aqueous dispersion used for film deposition is shown to be associated with a rearrangement of PEDOT-rich clusters into elongated domains, as evidenced from STM and AFM. Consistently, temperature dependent conductivity measurements for sorbitol-treated films reveal that charge transport occurs via quasi ID variable range hopping (VRH), in contrast to 3D VRH for untreated PEDOT:PSS films. The typical hopping distance of 60-90 nm, extracted from the conductivity measurements is consistent with hopping between the 30-40 nm sized grains observed with scanning probe microscopy. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.
CITATION STYLE
Nardes, A. M., Janssen, R. A. J., & Kemerink, M. (2008). A morphological model for the solvent-enhanced conductivity of PEDOT:PSS thin films. Advanced Functional Materials, 18(6), 865–871. https://doi.org/10.1002/adfm.200700796
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