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Transparent Thin-Film Transistors Based on Sputtered Electric Double Layer.

Wensi Cai1, Xiaochen Ma2, Jiawei Zhang3

  • 1School of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, UK. wensi.cai@postgrad.manchester.ac.uk.

Materials (Basel, Switzerland)
|August 5, 2017
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Summary

Fully transparent Indium-Gallium-Zinc-Oxide electric-double-layer thin-film transistors were fabricated at room temperature. These devices operate at low voltages and show potential for transparent electronic applications.

Keywords:
electric-double-layer (EDL)radio frequency (RF) magnetron sputtered SiO2transparent thin-film transistors (TFTs)

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Area of Science:

  • Materials Science
  • Electronics Engineering
  • Optoelectronics

Background:

  • Electric-double-layer (EDL) thin-film transistors (TFTs) offer low operation voltages.
  • Radio frequency (RF) magnetron sputtered SiO₂ gates are compatible with large-area electronics fabrication.
  • Transparent electronics require materials compatible with visible light transmission.

Purpose of the Study:

  • To fabricate fully transparent Indium-Gallium-Zinc-Oxide (IGZO)-based EDL TFTs on glass substrates at room temperature.
  • To investigate the optical and electrical properties of these novel transparent TFTs.
  • To assess the potential of these devices for transparent electronic applications.

Main Methods:

  • Fabrication of IGZO-based EDL TFTs on glass substrates at room temperature.
  • Characterization of optical transmittance in the visible light range.
  • Electrical performance testing, including operation voltage, subthreshold swing, and on-off ratio.
  • Evaluation of device stability under light irradiation and bias stress.

Main Results:

  • Achieved fully transparent IGZO-based EDL TFTs with ~80% transmittance in the visible spectrum.
  • Demonstrated low operation voltage of 1.5 V due to high EDL capacitance (0.3 µF/cm²).
  • Exhibited excellent electrical performance: subthreshold swing of 130 mV/dec and on-off ratio > 10⁵.

Conclusions:

  • Room-temperature fabrication of transparent IGZO-based EDL TFTs is feasible.
  • The devices show promising optical and electrical characteristics for transparent electronics.
  • Potential applications in battery-powered transparent electronic devices are suggested.