An Antagonistic Photovoltaic Memristor for Bioinspired Active Contrast Adaptation

IF 27.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Advanced Materials Pub Date : 2024-10-30 DOI:10.1002/adma.202409844
Guodong Gong, You Zhou, Ziyu Xiong, Tao Sun, Huaxin Li, Qingxiu Li, Wenyu Zhao, Guohua Zhang, Yongbiao Zhai, Ziyu Lv, Hongwei Tan, Ye Zhou, Su-Ting Han
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Abstract

Machine vision systems that consist of cameras and image-processing components for visual inspection and identification tasks play a critical role in various intelligent applications, including pilotless vehicles and surveillance systems. However, current systems usually possess a limited dynamic range and fixed photoresponsivity, restricting their capability of gaining high-fidelity images when encoding a high-contrast scene. Here, it is shown that a photovoltaic memristor incorporating two antagonistic photovoltaic junctions can autonomously adjust its response to varying light stimuli, enabling the amplification of shadows and inhibition of highlight saturation. Due to the dynamic photodoping effect at the p-n junction with an asymmetrical profile, the photocurrent polarities of the antagonistic memristor can be changed as the light intensity increases. The light-intensity-dependent switchable photovoltaic behaviors match Weber's law where photosensitivity is inversely proportional to the light stimuli. An 11 × 11 memristor array is used to detect a high-contrast scene with light intensities ranging from 1 to 5 × 104 µW cm−2, achieving a similar active contrast adaptation performance compared with the human visual systems (less than 1.2 s at 94 dB). This work paves the way for innovative neuromorphic device designs and may lead to the development of state-of-the-art active visual adaptation photosensors.

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用于生物启发式主动对比适应的拮抗光电晶体管
机器视觉系统由用于视觉检测和识别任务的摄像头和图像处理组件组成,在包括无人驾驶汽车和监控系统在内的各种智能应用中发挥着至关重要的作用。然而,目前的系统通常具有有限的动态范围和固定的光致发光率,这限制了它们在对高对比度场景进行编码时获得高保真图像的能力。这里的研究表明,包含两个拮抗光电结的光电忆阻器可以自主调整其对不同光刺激的响应,从而放大阴影并抑制高光饱和。由于 p-n 结具有非对称轮廓的动态光掺杂效应,拮抗记忆晶体管的光电流极性可随着光强度的增加而改变。这种随光照强度变化的可切换光电行为符合韦伯定律,即光敏度与光刺激成反比。利用一个 11 × 11 的忆阻器阵列来检测光照强度从 1 到 5 × 104 µW cm-2 的高对比度场景,实现了与人类视觉系统类似的主动对比度适应性能(94 dB 时小于 1.2 秒)。这项工作为创新的神经形态设备设计铺平了道路,并有可能开发出最先进的主动视觉适应光传感器。
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来源期刊
Advanced Materials
Advanced Materials 工程技术-材料科学:综合
CiteScore
43.00
自引率
4.10%
发文量
2182
审稿时长
2 months
期刊介绍: Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.
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