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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
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Diode: Forward bias

In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
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Biasing of P-N Junction01:16

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

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Published on: June 23, 2018

A Chemically Programmable Retinomorphic GaN p-n Diode for Multimode Visual Sensing.

Xin Liu1, Shi Fang1, Wei Chen1

  • 1iGaN Laboratory, School of Microelectronics, University of Science and Technology of China, Hefei, Anhui, China.

Advanced Materials (Deerfield Beach, Fla.)
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a chemically programmable vision sensor that mimics the human eye. This novel retinomorphic diode offers tunable sensing capabilities, enabling bio-inspired visual processing for advanced applications.

Keywords:
diodegallium nitridephotoelectric effectphotoelectric sensorphotopic visionsemiconductor

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Area of Science:

  • Materials Science and Engineering
  • Neuroscience and Bioengineering

Background:

  • Real-world vision requires sensors that handle diverse illumination and rapid changes.
  • Existing vision sensors lack chemical programmability, limiting biorealistic visual sensing.
  • Current sensors are primarily modulated by physical stimuli, not chemical signals.

Purpose of the Study:

  • To develop a chemically programmable retinomorphic diode for advanced visual sensing.
  • To integrate spiking response, light adaptation, and chemical tunability in a single device.
  • To explore bio-inspired visual processing and actuation through chemical programming.

Main Methods:

  • Fabrication of an ultracompact retinomorphic p-n diode.
  • Investigating the interplay between photoelectric and electrochemical processes at the semiconductor/electrolyte interface.
  • Demonstrating switchable response modes via chemical modulation of ion/molecule species.

Main Results:

  • The diode exhibits switchable response modes with chemical programmability.
  • It generates spikes upon illumination transitions and allows bidirectional tuning of steady-state current.
  • The device demonstrates spontaneous and chemically regulated light adaptation (scotopic to photopic).
  • A proof-of-concept visual-motor pathway with chemically programmable actuation was constructed.

Conclusions:

  • A chemically programmable retinomorphic platform combining physical and chemical modulation is demonstrated.
  • This platform enables bio-inspired multimode visual sensing and actuation.
  • The device offers a new paradigm for tunable, biorealistic vision systems.