Avalanche tuning in bionic MoS2/WS2 transistor for high-frequency visual behavior beyond human retina

Author:

Huo Nengjie1ORCID,Li Ling1,Li Shasha2,Wang Wenhai1,Zhang Jielian1,Sun Yiming1,Deng Qunrui1,Zheng Tao1,Lu Jianting3,Gao Wei1,Yang Mengmeng1,Wang Hanyu1,Pan Yuan1,Liu Xueting1,Yang Yani1,Li Jingbo1

Affiliation:

1. South China Normal University

2. Henan Normal University

3. Sun Yat-sen University

Abstract

Abstract

Visual adaptation of the retina has enabled to adapt and perceive a wide-range light stimuli, which however induces long time adaptation process leading to blindness, dizziness or other potential hazards1–3. In the realm of machine vision, when replacing the human retina for real-time image processing, the intricate circuits and algorithms are essential to ensure optimal performance and accurate recognition, as currently developed vision perception systems struggle to adapt images with varying brightness levels. Despite the attention garnered by adaptive devices, their potential application in machine vision systems is hampered by a sluggish adaptation process, making integration challenging.4–10 Here, we take advantage of avalanche tuning as feedforward inhibition in bionic two-dimensional (2D) transistor to realize active and rapid switchover of light perception mechanism for fast and high-frequency visual adaptation behavior, avoiding the usual long visual adaptation process and occurrence of potential harms. The adaptation speed is over 104 times faster than that of the human retina and the currently reported bionic sensors relying on feedback inhibition circuit. The sense-computing integrated junction-field-effect transistor (JFET) exhibits an extraordinary avalanche performance with low breakdown voltage (VEB) of approximately 10 V and high multiplication factor of 8.2×103, which can be tuned by gate voltage and light intensity and outperforms the state-of-the-art 2D avalanche transistors. By changing light stimulus from dim to bright, the sensory responsivity experiences great changes in both magnitude and sign (from 9.6×105 to -4×103 A/W), due to spontaneous transition of the photo-sensing mechanism between avalanche and photoconductive effect. Notably, this mechanism switches much faster than the chemical reaction between rod and cone cells, and the charge trapping/de-trapping mechanism in existing 2D machine vision systems. Thus, the device can emulate high-frequency visual behavior at 4 and 2.5 kHz under simulated scotopic and photopic adaptation conditions, possessing ultra-fast adaptation process of 142 and 427 µs, respectively, that is far beyond human retina function with long adaptation process up to few minutes. The − 3 dB bandwidth of our device reaches 8.3 kHz at weak light, also surpassing dynamic response of retina (500 Hz)11. More importantly, an ultra-fast adaptative machine vision has been achieved by integrating convolutional neural networks with bionic avalanche transistor, making a groundbreaking achievement with respect to its remarkable microsecond-level rapid adaptation capabilities and robust image recognition with over 97% precision in both dim and bright conditions. This work introduces an innovative bio-inspired vision device that relies on avalanche tuning operation as a faster and more predictive feedforward inhibitory mechanism, holding a huge application potential in next generation of high-frequency machine vision systems, promoting the technological innovation in field of autonomous driving and facial recognition, etc.

Publisher

Springer Science and Business Media LLC

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3