A morphological model for the solvent-enhanced conductivity of PEDOT:PSS thin films

A.M. Nardes, R.A.J. Janssen, M. Kemerink

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260 Citations (Scopus)
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Abstract

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 1D 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.
Original languageEnglish
Pages (from-to)865-871
JournalAdvanced Functional Materials
Volume18
Issue number6
DOIs
Publication statusPublished - 2008

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