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Related Experiment Video

Updated: May 13, 2026

Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors
09:59

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Published on: June 23, 2018

Hybrid Junction-Enabled Biomimetic Human Eye Structure for Large Dynamic Range Vision Sensor.

Daqi Chen1, Yueheng Lu1, Zhenye Zhan1

  • 1Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China.

Nanomaterials (Basel, Switzerland)
|May 12, 2026
PubMed
Summary

Researchers developed a novel photodetector mimicking the human eye's dynamic range. This device integrates functions of cone and rod cells for advanced machine vision applications.

Keywords:
VO2WSe2dynamic rangeheterojunctionphotodiodevan der Waals contactsvision sensor

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Area of Science:

  • Materials Science
  • Biomimetic Engineering
  • Optoelectronics

Background:

  • Human eye's dynamic range (DR) surpasses current machine vision systems.
  • Developing biomimetic retinal units is crucial for advanced machine vision.
  • Existing visual systems struggle to match the eye's adaptive DR.

Purpose of the Study:

  • To develop a photodetector with adaptive DR comparable to human retinal cells.
  • To create a dual-mode photodetector mimicking both cone and rod cells.
  • To enhance machine vision capabilities through biomimetic design.

Main Methods:

  • Fabrication of a two-terminal Au-contacted VO2/WSe2 heterojunction photodetector.
  • Characterization of the photodetector's performance in strong and weak light conditions.
  • Demonstration of image fusion using dual-mode detection.

Main Results:

  • The VO2/WSe2 heterojunction mimics cone cells (photoresponsivity R = 320 mA W-1).
  • The Au/WSe2 Schottky contact mimics rod cells (R = 217 A W-1, NEP = 248.2 fW/√Hz).
  • The dual-mode photodetector exhibits a fast response speed (< 39.28 μs) and enhanced image recognition via fusion.

Conclusions:

  • Contact engineering enables a photodetector with rod and cone cell functionality.
  • The developed visual imaging system achieves performance comparable to the human eye.
  • This work advances biomimetic retinal detecting units for machine vision.