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Area of Science:

  • Materials Science
  • Organic Electronics
  • Device Physics

Background:

  • High-performance non-volatile memory is crucial for advanced electronics.
  • Mechanical flexibility is essential for emerging wearable and foldable devices.

Purpose of the Study:

  • To develop solution-processed ferroelectric organic field-effect transistor memories with excellent mechanical flexibility.
  • To demonstrate dual-mode (p- and n-type) operation in these flexible memory devices.

Main Methods:

  • Fabrication of organic field-effect transistors using a ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) insulator and a quinoidal oligothiophene derivative (QQT(CN)4) semiconductor.
  • Testing of device performance under various mechanical deformations, including bending and folding.
  • Mechanical characterization using nano-indentation and nano scratch techniques.

Main Results:

  • Demonstrated non-volatile, solution-processed, dual-mode (p- and n-type) organic field-effect transistor memories.
  • Achieved excellent mechanical flexibility with reliable operation after 1,000 bending cycles at 500 μm radii and sharp folding.
  • Reported data retention of >6,000 s and endurance of 100 cycles.
  • Identified the crucial role of QQT(CN)4 in enhancing mechanical flexibility.

Conclusions:

  • The developed ferroelectric organic memory transistors exhibit outstanding mechanical robustness and dual-mode functionality.
  • These devices are highly promising for next-generation smart wearable and foldable electronic applications.