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Description:

Thin-film devices that transduce the chemical activity of ions into electronic signals are essential components in various applications, including healthcare diagnostics and environmental monitoring. Combinations of organic semiconductors (OSCs) and ion-selective materials have been explored for developing solution-processable ion sensors. However, the necessity of reference electrodes and operational stability in ion-permeable OSCs have posed questions regarding whether reliable measurements with thin-film components are attainable with OSCs. Herein, we report electric double-layer transistors (EDLTs) with OSCs in single-crystal forms for ion sensing. Our EDLTs demonstrated high operational stability, with a one-to-one relationship between the source electrode potential and device resistance, and served as quasi-reference electrodes. When our EDLT is served as quasi-reference electrode, its drift was as small as 0.5 mV/h and comparable to that of commonly employed reference electrodes. In our system, the semiconductor-electrolyte interface is self-passivated by the alkyl chains of OSCs in single-crystal structures, with the two-dimensional transport layer appearing unaltered upon gating. EDLT arrays with ion-selective and non-selective liquid junctions enable ion concentration sensing without a conventional reference electrode. These findings provide opportunities to develop thin-film devices based on OSCs for easy integration and reliable measurements.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: organic semiconductor, ion sensor

Date published: 2024-09-23

Publisher: Proceedings of the National Academy of Sciences

Journal:

• Proceedings of the National Academy of Sciences (ISSN: 10916490) vol. 121 issue. 40 e2405933121

Funding:

• MEXT | Japan Society for the Promotion of Science JP20H00392
• MEXT | Japan Society for the Promotion of Science JP22H04959
• MEXT | JST | Core Research for Evolutional Science and Technology JPMJCR21O3

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5078

First published URL: https://doi.org/10.1073/pnas.2405933121

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Updated at: 2024-12-03 16:30:55 +0900

Published on MDR: 2024-12-03 16:30:55 +0900