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Anisotropic conductivity of Cellulose-PEDOT:PSS composite materials studied with a generic 3D four-point probe tool
RISE - Research Institutes of Sweden, ICT, Acreo.
Linköping University, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.ORCID iD: 0000-0002-4919-1771
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
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2019 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 66, p. 258-264Article in journal (Refereed) Published
Abstract [en]

The conductive polymer poly(3,4-ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) is widely used in organic electronics and printed electronics due to its excellent electronic and ionic conductivity. PEDOT:PSS films exhibit anisotropic conductivities originating from the interplay of film deposition processes and chemical structure. The previous studies found that high boiling point solvent treated PEDOT:PSS exhibits an anisotropy of 3–4 orders magnitude. Even though both the in-plane and out-of-plane conductivities are important for the device performance, the out-of-plane conductivity is rarely studied due to the complexity with the experiment procedure. Cellulose-based paper or films can also exhibit anisotropic behavior due to the combination of their intrinsic fibric structure and film formation process. We have previously developed a conductive paper based on PEDOT:PSS and cellulose which could be used as the electrodes in energy storage devices. In this work we developed a novel measurement set-up for studying the anisotropy of the charge transport in such composite materials. A tool with two parallel plates mounted with spring loaded probes was constructed enabling probing both lateral and vertical directions and resistances from in-plane and out-of-plane directions to be obtained. The measurement results were then input and analyzed with a model based on a transformation method developed by Montgomery, and thus the in-plane and out-of-plane conductivities could be detangled and derived. We also investigated how the conductivity anisotropy depends on the microstructure of the cellulose template onto which the conductive polymer self-organizes. We show that there is a relatively small difference between the in-plane and out-of-plane conductivities which is attributed to the unique 3D-structure of the composites. This new knowledge gives a better understanding of the possibilities and limitations for using the material in electronic and electrochemical devices.

Place, publisher, year, edition, pages
2019. Vol. 66, p. 258-264
Keywords [en]
Cellulose, PEDOT:PSS, Composite material, Anisotropic conductivity, Four-point probe
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-36990DOI: 10.1016/j.orgel.2018.12.023OAI: oai:DiVA.org:ri-36990DiVA, id: diva2:1276600
Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S1566119918306657

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Håkansson, KarlGranberg, Hjalmar

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