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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Samenvatting

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.
Originele taal-2Engels
Pagina's (van-tot)865-871
TijdschriftAdvanced Functional Materials
Volume18
Nummer van het tijdschrift6
DOI's
StatusGepubliceerd - 2008

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