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Updated: Mar 25, 2026

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Zwitterion-Modified PMMA Interlayers for Reliable Dual-Mode Organic Neuromorphic Devices.

Seong Bin Woo1, Yonghee Kim1, Yu Kyeong Kim2

  • 1Department of Chemical Engineering, Pukyong National University, Busan 48513, Republic of Korea.

ACS Applied Materials & Interfaces
|March 23, 2026
PubMed
Summary

Researchers developed a new interlayer for organic electrochemical transistors (OECTs) and electrolyte-gated organic field-effect transistors (EGOFETs). This innovation overcomes performance trade-offs, enabling uncompromised dual-mode operation for neuromorphic computing.

Keywords:
dual-mode organic transistorsmemory retentionneuromorphic computingsynaptic plasticityzwitterionic interlayer

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Area of Science:

  • Materials Science
  • Electronics
  • Neuroscience

Background:

  • Organic electrochemical transistors (OECTs) and electrolyte-gated organic field-effect transistors (EGOFETs) are key for neuromorphic computing.
  • Conventional devices face performance trade-offs due to conflicting interfacial requirements for different operating modes.

Purpose of the Study:

  • To engineer a novel interlayer material that resolves the incompatibility between EGOFET and OECT operational requirements.
  • To enhance the performance of dual-mode organic transistors for advanced computing applications.

Main Methods:

  • Developed a zwitterionic-modified poly(methyl methacrylate) (PMMA-ZI) interlayer.
  • Investigated the material's amphiphilic properties for simultaneous dipolar polarization and ion transport.
  • Fabricated and characterized dual-mode organic transistors with the PMMA-ZI interlayer.

Main Results:

  • Achieved a 13.57-fold improvement in the volumetric capacitance-mobility product (57.25 F cm⁻¹ V⁻¹ s⁻¹) in OECT mode.
  • Demonstrated significantly enhanced synaptic plasticity with 6.12 times better memory retention.
  • Successfully implemented 4-bit reservoir computing for pattern recognition.

Conclusions:

  • The PMMA-ZI interlayer enables uncompromised multifunctional operation in dual-mode organic transistors.
  • This breakthrough establishes a new materials paradigm for neuromorphic computing and bioelectronics.
  • The developed devices show great potential for next-generation intelligent systems.