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Anisotropic conductivity of Cellulose-PEDOT:PSS composite materials studied with a generic 3D four-point probe tool
Department of Printed Electronics, RISE Acreo, Norrköping, Sweden.
Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering.
RISE Bioeconomy, Stockholm, Sweden.
RISE Bioeconomy, Stockholm, Sweden.
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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 conducive 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 conducive 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 conducive 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
ELSEVIER SCIENCE BV , 2019. Vol. 66, p. 258-264
Keywords [en]
Cellulose; PEDOT: PSS; Composite material; Anisotropic conductivity; Four-point probe
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-154091DOI: 10.1016/j.orgel.2018.12.023ISI: 000455249800035OAI: oai:DiVA.org:liu-154091DiVA, id: diva2:1283670
Note

Funding Agencies|Swedish Foundation for Strategic Research [GMT14-0058]

Available from: 2019-01-29 Created: 2019-01-29 Last updated: 2019-10-10

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The full text will be freely available from 2021-12-17 00:01
Available from 2021-12-17 00:01

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Wang, XinBerggren, Magnus

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Wang, XinGrimoldi, AndreaMengistie, DesalegnEngquist, IsakBerggren, Magnus
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