The curious out-of-plane conductivity op PEDOT:PSS

K. Ruit, van de, I. Katsouras, D.G.F.M. Bollen, T. Mol, R.A.J. Janssen, D.M. Leeuw, de, M. Kemerink

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26 Citations (Scopus)
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For its application as transparent conductor in light-emitting diodes and photovoltaic cells, both the in-plane and out-of-plane conductivity of PEDOT:PSS are important. However, studies into the conductivity of PEDOT:PSS rarely address the out-of-plane conductivity and those that do, report widely varying results. Here a systematic study of the out-of-plane charge transport in thin films of PEDOT:PSS with varying PSS content is presented. To this end, the PEDOT:PSS is enclosed in small interconnects between metallic contacts. An unexpected, but strong dependence of the conductivity on interconnect diameter is observed for PEDOT:PSS formulations without high boiling solvent. The change in conductivity correlates with a diameter dependent change in PEDOT:PSS layer thickness. It is suggested that the order of magnitude variation in out-of-plane conductivity with only a 3-4-fold layer thickness variation can quantitatively be explained on basis of a percolating cluster model.
Original languageEnglish
Pages (from-to)5787-5793
Number of pages6
JournalAdvanced Functional Materials
Issue number46
Publication statusPublished - 2013


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