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Structural Modifications for Tuning Performance and Operational Modes in n-Type Organic Electrochemical Transistors.

Xinru Liu1, Yu Xiao2,3, Chaoyi Yan2

  • 1School of Microelectronics, Shanghai University, Shanghai 201800, China.

ACS Applied Materials & Interfaces
|January 24, 2025
PubMed
Summary

Researchers developed new naphthalene diimide (NDI)-based small molecules for organic electrochemical transistors (OECTs). These materials show improved performance, including record-low threshold voltage and enhanced electron mobility, with one achieving self-doping for stable operation.

Keywords:
n-type mixed ionic-electronic conductornaphthalene diimidesproperties modulationstructural regulationstructure–property relationship

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Electrochemistry

Background:

  • Organic mixed ionic-electronic conductors (OMIECs) are vital for organic electrochemical transistors (OECTs).
  • Limited research exists on structure-performance relationships in small-molecule n-type OMIECs.

Purpose of the Study:

  • To design and synthesize novel naphthalene diimide (NDI)-based n-type small molecules.
  • To investigate the impact of π-conjugation extension and electron-withdrawing groups on OECT performance.
  • To establish structure-property correlations for advanced n-type OMIECs.

Main Methods:

  • Synthesis of a series of NDI-based small molecules with varied π-conjugation and electron-withdrawing groups.
  • Fabrication and characterization of OECTs using the synthesized materials.
  • Analysis of electrical properties, including threshold voltage, electron mobility, and transconductance.
  • Investigation of self-doping mechanisms and operational stability.

Main Results:

  • Achieved a record-low threshold voltage of -0.022 V for OECTs based on 4Br-NDI-3EG.
  • Synthesized NDI-DTYA-3EG demonstrated a 2-order improvement in electron mobility (1.04 × 10⁻² cm² V⁻¹ s⁻¹) due to mixed molecular orientation.
  • NDI-DTYM-3EG exhibited self-doping capabilities with a low LUMO energy level (-4.51 eV), enabling n-depletion-mode operation.
  • NDI-DTYM-3EG-based devices showed high stability, retaining 98% of initial current after 150 minutes.

Conclusions:

  • Structural modifications of NDI-based molecules significantly impact OECT performance and operational modes.
  • The developed n-type small molecules offer promising characteristics for high-performance OECT applications.
  • This work provides valuable insights for designing next-generation n-type OMIEC materials.