Ionic liquid-water mixtures and ion gels as electrolytes for organic electrochemical transistorsElectronic supplementary information (ESI) available: Device structures; OECT current modulation as a function of Vg for pure ionic liquid and mixtures at 5%, 50%, 90%, 95%, 99% H2O v/v; transfer curves of OECTs with PEDOT:PSS gate electrodes; comparison of transfer curves obtained with NaCl and Cyphos® IL 106/H2O mixtures; Table ESI1 (ionic conductivities) and Table ESI2 (ON/OFF ratios). See DOI: 10.

Organic Electrochemical Transistors (OECTs) are widely investigated for applications in bioelectronics. Ionic liquids (ILs) are, in principle, interesting candidates as gating media in OECTs. Nevertheless, ILs can exhibit excessively high viscosity that prevents their straightforward application in...

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Hauptverfasser: Yi, Zhihui, Natale, Giovanniantonio, Kumar, Prajwal, Mauro, Eduardo Di, Heuzey, Marie-Claude, Soavi, Francesca, Perepichka, Iryna I, Varshney, Sunil K, Santato, Clara, Cicoira, Fabio
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Sprache:eng
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Zusammenfassung:Organic Electrochemical Transistors (OECTs) are widely investigated for applications in bioelectronics. Ionic liquids (ILs) are, in principle, interesting candidates as gating media in OECTs. Nevertheless, ILs can exhibit excessively high viscosity that prevents their straightforward application in OECTs. Here we report two processing approaches to apply the highly viscous ionic liquid triisobutyl(methyl)phosphonium tosylate (Cyphos® IL 106) in OECTs based on poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS), namely IL-H 2 O binary mixtures and ion gels. The use of Cyphos® IL 106-H 2 O binary mixtures and ion gels as gating media determines an increase of the OECT modulation, with respect to the pure ionic liquid. This increase cannot be explained simply by the change of the viscosity and ionic conductivity of the ionic liquid-H 2 O mixtures with the increase of the H 2 O content. Using high surface area activated carbon gates, ON/OFF ratios as high as 5000 are achieved with Cyphos® IL 106-H 2 O mixtures at 5 and 10% H 2 O v/v. Electrolytes consisting of mixtures of phosphonium ionic liquids and water lead to high ON/OFF ratios in organic electrochemical transistors making use of activated carbon gates.
ISSN:2050-7526
2050-7534
DOI:10.1039/c5tc00712g