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An Alternative Anionic Polyelectrolyte for Aqueous PEDOT Dispersions: Toward Printable Transparent Electrodes
Anna I Hofmann1, Wiljan T T Smaal1, Muhammad Mumtaz1
1Laboratoire de Chimie des Polymères Organiques (LCPO), Université de Bordeaux, CNRS UMR 5629, Allée Geoffroy Saint Hilaire, Bât. B8, CS 50023, 33615 Pessac Cedex (France).
Angewandte Chemie (International Ed. in English)
|June 3, 2015
Summary
Researchers developed a new aqueous dispersion of PEDOT using a PSTFSIK stabilizer, overcoming hygroscopicity and acidity issues. This stable, printable PEDOT offers excellent optoelectronic performance for flexible organic electronics.
Area of Science:
- Materials Science
- Polymer Chemistry
- Organic Electronics
Background:
- Organic conducting polymers are vital for printable electronics.
- Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is widely used but suffers from hygroscopicity and acidity.
- Stabilizing PEDOT in aqueous dispersions is crucial for improved performance and processability.
Purpose of the Study:
- To develop a stable aqueous dispersion of PEDOT by replacing PSS with a basic polyanion.
- To characterize the new PEDOT dispersion for its composition, morphology, doping, rheology, and optoelectronic properties.
- To evaluate the suitability of the new PEDOT dispersion as flexible electrodes in organic electronic devices.
Main Methods:
- Oxidative polymerization of EDOT in an aqueous PSTFSIK solution.
- Characterization of the resulting PEDOT:PSTFSIK dispersions.
- Fabrication and testing of organic light-emitting diode (OLED) and organic photovoltaic (OPV) devices using the new PEDOT dispersions as electrodes.
Main Results:
- Stable aqueous PEDOT:PSTFSIK dispersions were successfully synthesized.
- The dispersions exhibited excellent printability and good optoelectronic performance (sheet resistance of 238 Ohm/sq at 91% transmittance, conductivity >260 S/cm).
- The PEDOT:PSTFSIK dispersions were effectively integrated as flexible electrodes in OLED and OPV devices.
Conclusions:
- Replacing PSS with PSTFSIK provides a stable, less acidic alternative for PEDOT dispersions.
- The new PEDOT:PSTFSIK dispersions demonstrate promising properties for flexible and printable organic electronics.
- This advancement facilitates the development of high-performance, durable organic electronic devices.
