Bioinspired Artificial Visual System Based on 2D WSe₂ Synapse Array

Abstract

Machine vision systems that capture images for visual inspection and recognition tasks must be able to perceive, memorize, and compute any color scene. To achieve this, most of the current visual systems use circuits and algorithms which may reduce efficiency and increase complexity. Herein, a 2D semiconductor tungsten diselenide (WSe2)‐based phototransistor that successfully demonstrates an artificial vision system integrating the processing capability of visual information sensing memory, is reported. Furthermore, based on a 6 × 6 fabricated retinal perception array, artificial visual information sensing memory and processing system are proposed to perform image recognition tasks, which can avoid the time delay and energy consumption caused by data conversion and movement. On the other hand, highly linear symmetric synaptic plasticity can be achieved based on the modulation of carrier types in WSe2 transistors with different thicknesses, facilitating the high level of training and inference accuracy for artificial neural networks. Last, through training and inference simulations, the feasibility of the hybrid synapses for optical neural networks (ONN) is demonstrated.

All-Photon Bipolar Reversible Modulation Artificial Synapse for Color Perception and Mitigation of Glare Phenomenon

“…Artificial synapses have developed into many types, among which artificial visual synapses (AVS) that encompass optical sensing and memory capabilities have received widespread attention. The approach of biomimicking the biological visual neural system using these synapses has been extensively applied. − Perovskite materials have been considered as the promising candidate for AVS applications due to the outstanding optoelectronic properties , and characteristics related to ion migration. − …”

All-Photon Bipolar Reversible Modulation Artificial Synapse for Color Perception and Mitigation of Glare Phenomenon

“…Arti cial synapses have developed into many types, among which arti cial visual synapses (AVS) that encompass optical sensing and memory capabilities have received widespread attention. The approach of biomimicking the biological visual neural system using these synapses has been extensively applied 6,7 . AVS can be categorized based on their structure into two distinct types: standalone devices featuring separate light-sensing and memory modules 8,9 , and integrated devices combining both light sensing and memory modules into one unit [10][11][12][13] .…”

All-Photon Bipolar Reversible Modulation Artificial Synapse for Color Perception and Mitigation of Glare Phenomenon

“…Artificial synapses have developed into many types, among which artificial visual synapses (AVS) that encompass optical sensing and memory capabilities have received widespread attention. The approach of biomimicking the biological visual neural system using these synapses has been extensively applied 6,7 . AVS can be categorized based on their structure into two distinct types: standalone devices featuring separate light-sensing and memory modules 8,9 , and integrated devices combining both light sensing and memory modules into one unit [10][11][12][13] .…”