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Defect-induced subgap state engineering in neuromorphic metal-oxide phototransistors for in-sensor color processing.

Eun Chong Ju1, Dong Hwan Byeon1, Jong Min Lee1

  • 1Department of Intelligent Semiconductor Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea. skpark@cau.ac.kr.

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Researchers developed a novel neuromorphic phototransistor using subgap-engineered metal-oxide semiconductors. This compact device enables efficient in-sensor color image processing for machine vision systems, enhancing performance without complex structures.

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Area of Science:

  • Materials Science
  • Neuroscience
  • Computer Engineering

Background:

  • Neuromorphic photosensors mimic the human retina for machine vision.
  • Existing devices often suffer from complexity, low resolution, and high energy use due to heterojunctions or complex circuits.

Purpose of the Study:

  • To propose a simplified neuromorphic phototransistor with a homogeneous channel structure.
  • To demonstrate in-sensor color image processing capabilities using subgap-engineered metal-oxide (MO) semiconductors.

Main Methods:

  • Developed subgap-engineered MO semiconductors by doping with alkali metal ions.
  • Fabricated a neuromorphic phototransistor with a homogeneous channel structure.
  • Utilized a 7 × 7 array of these phototransistors for image refinement tasks.

Main Results:

  • The engineered MO phototransistors exhibited broad spectral responsivity and analog conductance modulation.
  • Doping with Li (5 at%) enabled full-color detection and distinct sensing performance based on input color.
  • The phototransistor array successfully performed color character sharpness, noise reduction, and contrast enhancement.

Conclusions:

  • Subgap-engineered MO semiconductors offer a compact and efficient solution for neuromorphic photosensors.
  • The developed phototransistors achieve in-sensor color image processing, improving machine vision systems.
  • This approach overcomes limitations of traditional heterojunction-based neuromorphic devices.