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Conductivity, work function, and environmental stability of PEDOT : PSS thin films treated with sorbitol
Eindhoven University of Technology, Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7104-7127
Philips Research Labs, Netherlands.
Eindhoven University of Technology, Netherlands.
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2008 (English)In: Organic electronics, ISSN 1566-1199, Vol. 9, no 5, 727-734 p.Article in journal (Refereed) Published
Abstract [en]

The electrical properties of poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) thin films deposited from aqueous dispersion using different concentrations of sorbitol have been studied in detail. Although it is well known that sorbitol enhances the conductivity of PEDOT:PSS thin films by three orders of magnitude, the origin and consequences of sorbitol treatment are only partly understood and subject of further study. By thermal annealing of spin coated PEDOT:PSS/sorbitol films and simultaneously monitoring the conductivity, we demonstrate that the strong increase in conductivity coincides with evaporation of sorbitol from the film. Hence, sorbitol is a processing additive rather than a (secondary) dopant. Scanning Kelvin probe microscopy reveals that sorbitol treatment causes a reduction of the work function from 5.1 eV to 4.8-4.9 eV. Sorbitol also influences the environmental stability of the films. While the conductivity of the pristine PEDOT:PSS films increases by about one order of magnitude at similar to 50% RH due to an ionic contribution to the overall conductivity, films prepared using sorbitol exhibit an increased environmental stability with an almost constant conductivity up to 45% RH and a slight decrease at 50% RH. The higher stability results from a reduced tendency to take up water from the air, which is attributed to a denser packing of the PEDOT:PSS after sorbitol treatment.

Place, publisher, year, edition, pages
Elsevier , 2008. Vol. 9, no 5, 727-734 p.
Keyword [en]
PEDOT : PSS; conductivity; sorbital; work function; water uptake; scanning Kelvin probe microscopy
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-118189DOI: 10.1016/j.orgel.2008.05.006ISI: 000259133500024OAI: oai:DiVA.org:liu-118189DiVA: diva2:813507
Note

Funding Agencies|European Union Programme of High Level Scholarships for Latin America [ID#E03D19439BR]

Available from: 2015-05-22 Created: 2015-05-22 Last updated: 2015-06-01

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Kemerink, Martijn
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