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Effects of the Ionic Currents in Electrolyte-gated Organic Field-Effect Transistors

Authors

  • Elias Said,

    Corresponding author
    1. Department of Science and Technology (ITN), Linköping University, Organic Electronics SE-601 74 Norrköping (Sweden)
    • Department of Science and Technology (ITN), Linköping University, Organic Electronics SE-601 74 Norrköping (Sweden).
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  • Oscar Larsson,

    1. Department of Science and Technology (ITN), Linköping University, Organic Electronics SE-601 74 Norrköping (Sweden)
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  • Magnus Berggren,

    1. Department of Science and Technology (ITN), Linköping University, Organic Electronics SE-601 74 Norrköping (Sweden)
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  • Xavier Crispin

    Corresponding author
    1. Department of Science and Technology (ITN), Linköping University, Organic Electronics SE-601 74 Norrköping (Sweden)
    • Department of Science and Technology (ITN), Linköping University, Organic Electronics SE-601 74 Norrköping (Sweden).
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  • The authors gratefully acknowledge the Swedish Foundation for Strategic Research (SSF), VINNOVA, the Royal Swedish Academy of Sciences (KVA), the Swedish Research Council, Knut och Alice Wallenbergs Stiftelse, COE@COIN, and Linköping University for financial support of this project. In addition, the authors wish to thank Frank Louwet at AGFA for providing the PSSH material. This work was supported by the EU Integrated Project NAIMO (No NMP4-CT-2004-500355). Supporting Information is available online from Wiley Interscience or from the author.

Abstract

Polyelectrolytes are promising materials as gate dielectrics in organic field-effect transistors (OFETs). Upon gate bias, their polarization induces an ionic charging current, which generates a large double layer capacitor (10–500 µF cm−2) at the semiconductor/electrolyte interface. The resulting transistor operates at low voltages (<1 V) and its conducting channel is formed in ∼50 µs. The effect of ionic currents on the performance of the OFETs is investigated by varying the relative humidity of the device ambience. Within defined humidity levels and potential values, the water electrolysis is negligible and the OFETs performances are optimum.

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