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Fully Transparent, Ultrathin Flexible Organic Electrochemical Transistors with Additive Integration for Bioelectronic
Ashuya Takemoto1,2,3, Teppei Araki1,2,3, Kazuya Nishimura1,2,3
1The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Ibaraki, 567-0047, Japan.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 14, 2022
Summary
Researchers developed fully transparent, ultrathin organic electrochemical transistors (OECTs) for bioelectronic sensors. These flexible devices offer high optical transparency and efficient electronic sensing, enabling multimodal assessments for applications like human stress monitoring.
Area of Science:
- Bioelectronics
- Materials Science
- Nanotechnology
Background:
- Optical transparency is crucial for multimodal optical assessment in bioelectronic sensors.
- Ultrathin organic electrochemical transistors (OECTs) offer potential as efficient bioelectronic transducers due to high transconductance and tissue conformability.
- Fabricating fully transparent ultrathin OECTs is challenging due to harsh nanomaterial etching processes.
Purpose of the Study:
- To develop fully transparent, ultrathin, and flexible OECTs using additive integration processes.
- To overcome fabrication challenges associated with nanomaterial etching for transparent OECTs.
- To demonstrate the utility of these OECTs in multimodal bioelectronic sensing applications.
Main Methods:
- Utilized selective-wetting deposition and thermally bonded lamination for additive integration.
- Employed Ag nanowire electrodes and conducting polymer channels.
- Fabricated ultrathin (<5 µm) OECTs with high visible transmittance (>90%).
Main Results:
- Achieved unprecedented flexible OECTs with high visible transmittance (>90%) and high transconductance (≈1 mS) at low voltages (<0.6 V).
- Demonstrated successful electroencephalogram acquisition and nitrate ion sensing.
- Showcased compatibility with simultaneous optical blood flowmetry assessments due to device transparency.
Conclusions:
- The developed transparent, ultrathin, and flexible OECTs offer a promising platform for advanced bioelectronic sensors.
- These devices enable multimodal assessments, integrating electronic sensing with optical monitoring.
- Potential applications include human stress monitoring, leveraging simultaneous physiological data acquisition.
