Realization of an Artificial Visual Nervous System using an Integrated Optoelectronic Device Array

Tae Ju Lee, Kwang Ro Yun, Su Kyung Kim, Jong Ho Kim, Junyoung Jin, Kee Baek Sim, Da Hoon Lee, Gyu Weon Hwang, Tae Yeon Seong

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Human behavior (e.g., the response to any incoming information) has very complex forms and is based on the response to consecutive external stimuli entering varied sensory receptors. Sensory adaptation is an elementary form of the sensory nervous system known to filter out irrelevant information for efficient information transfer from consecutive stimuli. As bioinspired neuromorphic electronic system is developed, the functionality of organs shall be emulated at a higher level than the cell. Because it is important for electronic devices to possess sensory adaptation in spiking neural networks, the authors demonstrate a dynamic, real-time, photoadaptation process to optical irradiation when repeated light stimuli are presented to the artificial photoreceptor. The filtered electrical signal generated by the light and the adapting signal produces a specific range of postsynaptic states through the neurotransistor, demonstrating changes in the response according to the environment, as normally perceived by the human brain. This successfully demonstrates plausible biological sensory adaptation. Further, the ability of this circuit design to accommodate changes in the intensity of bright or dark light by adjusting the sensitivity of the artificial photoreceptor is demonstrated. Thus, the proposed artificial photoreceptor circuits have the potential to advance neuromorphic device technology by providing sensory adaptation capabilities.

Original languageEnglish
Article number2105485
JournalAdvanced Materials
Issue number51
Publication statusPublished - 2021 Dec 23


  • artificial synapses
  • perovskite patterning
  • polymer electrolytes
  • sensory adaptation

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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