CMOS-compatible retinomorphic Si photodetector for motion detection
作者机构：Faculty of Materials and ManufacturingBeijing University of Technology Key Laboratory of Optoelectronics Technology of Education Ministry of ChinaFaculty of Information TechnologyBeijing University of Technology School of PhysicsBeihang University
出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))
年 卷 期：2023年第66卷第6期
页 面：242-249页
核心收录：
学科分类：0831[工学-生物医学工程（可授工学、理学、医学学位）] 08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 0803[工学-光学工程] 0836[工学-生物工程]
基 金：supported by Beijing Natural Science Foundation (Grant Nos. JQ20027, 4222065) National Natural Science Foundation of China (Grant No. 61922005) NSAF Joint Fund (Grant No. U1930105) National Key Research and Development Program of China (Grant No. 2021YFA0715602)
主 题：retina photodetector motion detection bio-inspired in-sensor computing
摘 要：Efficient motion detection is essential for the Internet of Things. However, it suffers from overloading redundant static background information. Inspired by the human visual system, which is efficient in motion detection, we propose a silicon-based retinomorphic photodetector with a simple metal/insulator/semiconductor(MIS)structure, which is compatible with the complementary metal-oxide-semiconductor(CMOS)industry. In contrast to conventional photodetectors that generate a sustained photocurrent, our retinomorphic photodetector is sensitive only to the change in light intensity and therefore filters the redundant static background. In addition, it shows logarithmic dependence on the light intensity, which simplifies the contrast ratio measurement. Based on our moving object recognition experiment, after filtering background information, the information to be analyzed is reduced to 27.3%, thereby improving the image recognition efficiency in the subsequent processing tasks. This innovative and industry-compatible retinomorphic photodetector will facilitate the construction of future efficient motion detection systems.
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