A morphological model for the solvent-enhanced conductivity of PEDOT : PSS thin films
2008 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 18, no 6, 865-871 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2008. Vol. 18, no 6, 865-871 p.
IdentifiersURN: urn:nbn:se:liu:diva-118194DOI: 10.1002/adfm.200700796ISI: 000254872100003OAI: oai:DiVA.org:liu-118194DiVA: diva2:813502