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Deep-Ultraviolet Transparent Electrode Design for High-Performance and Self-Powered Perovskite Photodetector.

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Nanomaterials (Basel, Switzerland)
|November 24, 2023
PubMed
Summary

Highly transparent and conductive indium-tin-oxide (ITO) thin films were developed for ultraviolet C (UVC) photodetectors. These films enable efficient bottom-illuminated devices with excellent performance characteristics.

Keywords:
254 nm UVC detectionhalide perovskite photodetectorhigh on/off ratiohigh responsivityself-powered photodetector

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Indium-tin-oxide (ITO) is a widely used transparent conductive material.
  • Developing efficient electrodes for ultraviolet C (UVC) photodetectors is crucial for various applications.
  • Bottom-illumination architectures require electrodes with both high transparency and electrical conductivity in the deep-UV spectrum.

Purpose of the Study:

  • To prepare a highly crystalline and transparent ITO thin film for use as an electrode in UVC photodetectors.
  • To investigate the optical and electrical properties of the ITO thin film.
  • To fabricate and characterize a UVC photodetector utilizing the developed ITO electrode.

Main Methods:

  • RF sputtering deposition of a 26.6 nm thick ITO thin film on a quartz substrate.
  • Post-annealing treatment of the deposited ITO film.
  • Fabrication of a lead-halide-perovskite-based photodetector in a vertical structure.
  • Optical transmittance measurements at 254 nm and electrical conductivity measurements.
  • Performance characterization of the UVC photodetector under 254 nm illumination.

Main Results:

  • The post-annealed ITO thin film exhibited good transparency (67% at 254 nm) and high electrical conductivity (11.3 S/cm).
  • The fabricated UVC photodetector showed an excellent on/off ratio (1.05 × 10^4).
  • The device achieved a superb responsivity (250.98 mA/W) and high specific detectivity (4.71 × 10^12 Jones).

Conclusions:

  • Post-annealed ITO ultrathin films meet the stringent requirements for electrodes in high-performance bottom-illuminated optoelectronic devices.
  • The developed ITO films are suitable for fabricating efficient UVC photodetectors.
  • This work demonstrates a viable approach for advanced deep-UV detection technologies.