Ultrasensitive Flexible Memory Phototransistor with Detectivity of 1.8×10¹³ Jones for Artificial Visual Nociceptor

Abstract

Emerging intelligent devices that can simulate an artificial intelligence vision system are of great interest for the development of modern information technology. Nociceptor is a crucial sensory neuron that recognizes harmful inputs and sends pain signals to the central nervous system to avoid injury; however, visual nociceptors, considered to be a key bionic function to protect eyesight based on optoelectronic devices, have yet to be developed. Herein this study, a three‐terminal flexible memory phototransistor (MPT) is first fabricated, which simulates the visual nociceptive behavior by adjusting light stimulation. The CsPbBr3 quantum‐dots (QDs)‐few‐layered black phosphorous nanosheets (FLBP NSs) heterojunction MPT demonstrates high responsivity of 7.2 × 103 AW−1 and high detectivity of 1.8 × 1013 Jones due to the high absorption coefficient of CsPbBr3 QDs materials and a high carrier transport property of FLBP NSs. Moreover, the proposed device can be used to emulate ultraviolet‐stimuli‐induced characteristics of visual nociceptors such as a threshold, no adaption, relaxation, allodynia, and hyperalgesia. It provides a new avenue for the realization of next‐generation neural‐integrated devices via its visual pain sense‐perception abilities.

Emerging photoelectric devices for neuromorphic vision applications: principles, developments, and outlooks

“…The aim for visual bionics is to eventually apply artificial intelligent vision systems to the real world. Gong et al [ 189 ] proposed a photoelectronic transistor based on CsPbBr 3 quantum dot and black phosphorus nanosheet heterojunction to realize the mimicry of visual nociceptive receptors. The transistor can emulate the threshold, no adaption, relaxation, allodynia, and hyperalgesia characteristics of photonic nociceptive receptors under UV light.…”

Artificial Neuron Devices

“…Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). (l–n) Reproduced with permission from ref . Copyright 2022 Wiley.…”

“…The device was able to realize basic neuromorphic functions at low operating voltages with femto-joule to pico-joule levels of energy consumption per spiking event. To achieve flexibility, Han’s group recently reported a flexible phototransistor based on a perovskite/black phosphorus heterojunction material (Figure l) . CsPbBr 3 quantum dots were allowed to self-assemble onto few-layered black phosphorus nanosheets through a solution process, which was used as the channel material.…”

Bioinspired Artificial Visual System Based on 2D WSe2 Synapse Array

“…In the human visual system, the retina preprocesses the image while receiving light signals; and then, transmits the extracted simplified information to the visual cortex for more complex information processing. [11,12] Modeling this biological vision system in hardware requires a light-sensitive element that acts as retinal neurons, such as photoreceptors and ganglion cells. However, conventional passive photodetectors are not directly applicable because they lack neuromorphic capabilities.…”