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Co-Evaporated Ratio-Tunable TexSe1-x Film for High-Performance Multiband Photodetection Toward Subretinal Color

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Researchers developed a biomimetic color vision system using novel photodetectors. This system mimics human eye cone cells for accurate color recognition, paving the way for advanced visual devices.

Keywords:
TexSe1‐x alloycolor recognitiongradient energy‐bandphotodetectors

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Area of Science:

  • Optoelectronics
  • Biomimetic systems
  • Materials science

Background:

  • The human visual system processes light intensity, color, and patterns, inspiring biomimetic optoelectronic devices.
  • Photodetectors are key components in biomimetic visual systems but typically lack color information extraction.
  • Current photodetectors output photocurrent proportional to light intensity, not spectral information.

Purpose of the Study:

  • To design and fabricate a biomimetic color vision system.
  • To mimic the functionality of cone cells in the human visual system.
  • To achieve precise recognition of incident light wavelength.

Main Methods:

  • Fabrication of three distinct photodetector devices with the architecture ITO/ZnO/Te extsubscript{x}Se extsubscript{1-x}/Te extsubscript{0.7}Se extsubscript{0.3}/Au, where x = 0.3, 0.48, and 0.55.
  • Preparation of Te extsubscript{x}Se extsubscript{1-x} films using co-evaporation.
  • In situ fabrication of Te extsubscript{x}Se extsubscript{1-x}/Te extsubscript{0.7}Se extsubscript{0.3} stacks with gradient band structures.

Main Results:

  • Achieved a minimum dark current density of 1.86 × 10 extsuperscript{-6} mA cm extsuperscript{-2} and external quantum efficiency >90% at 450 nm for x = 0.3.
  • Demonstrated distinct photoresponse from the three device types, mimicking cone cell functionality.
  • Enabled precise recognition of incident light wavelength with a calculated error <0.4%.

Conclusions:

  • Successfully mimicked the color recognition behavior of the human visual system.
  • The developed photodetector system provides a foundation for future biomimetic visual devices.
  • Offers guidance for designing advanced optoelectronic systems inspired by biological vision.