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Highly Sensitive Artificial Visual Array Using Transistors Based on Porphyrins and Semiconductors.

Xin Wang1, Yang Lu1, Junyao Zhang1

  • 1Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai, 201804, P. R. China.

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Summary

Researchers developed new artificial visual systems using light-stimulated synaptic transistors. These devices show high sensitivity for image sensing and storage, enabling intelligent visual systems with ultralow energy consumption.

Keywords:
artificial visual systemsorganic semiconductorsporphyrinssynapsestransistors

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Area of Science:

  • Materials Science
  • Neuroscience
  • Computer Science

Background:

  • Artificial visual systems are crucial for artificial intelligence.
  • Neuromorphic computing utilizes light-stimulated synaptic devices for artificial vision.

Purpose of the Study:

  • To demonstrate optoelectronic synaptic transistors for artificial visual systems.
  • To enhance image sensing and storage capabilities with high photosensitivity and tunable synaptic plasticity.

Main Methods:

  • Fabrication of synaptic transistors using 5,15-(2-hydroxyphenyl)-10,20-(4-nitrophenyl)porphyrin (TPP) and dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT).
  • Characterization of device performance including photosensitivity, synaptic plasticity modulation by light signals (intensity, width, wavelength), and low-voltage operation.

Main Results:

  • Devices exhibit high photosensitivity and tunable synaptic plasticity, with synaptic weight modulated by light.
  • Ultrasensitive artificial visual array detects light signals as low as 1 µW cm-2.
  • Demonstrated low-voltage operation (-70 µV) with ultralow energy consumption (1.4 fJ), successful image sensing, storage, information preprocessing, and noise reduction.

Conclusions:

  • TPP-based optoelectronic synaptic transistors show excellent synaptic behavior.
  • These devices hold significant potential for developing advanced intelligent visual systems.
  • The developed artificial visual array demonstrates ultrasensitive and low-power image sensing and storage capabilities.