Shim Soobin, Kim Seongchan, Lee Donghyun, Kim Hyeongtae, Kwon Mi Ji, Cho Su-Yeon, Lestari Windy Ayu, Seo Jaeyoung, Yeo Dongjoon, Na Jina, Kundale Somnath Suhas, Oh Nuri, Park Jun Hong
Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, Gyeongsangnam-do, 52828, Republic of Korea.
Division of Materials Science and Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea.
Small. 2025 Mar 3:e2410892. doi: 10.1002/smll.202410892.
Biological systems excel in image recognition with low power and fast responses. Inspired by the human eye, researchers have developed solid-state artificial visual systems. In this study, a retinomorphic artificial synapse device based on a tungsten diselenide (WSe2)/indium arsenide quantum dot (InAs QD) heterostructure is developed. This device exhibits enhanced short-wavelength infrared (SWIR) responsivity at 1060 nm, which is a synaptic behavior analogous to the human retina. The WSe2/InAs QD improves charge transport and photon absorption through the quantum confinement effects of InAs QDs, facilitating efficient SWIR detection. The heterojunction enables effective electron-hole pair separation, enhancing the photodetector performance. The device adapts to SWIR signal pulses like the human eye to light flicker. The WSe₂/InAs QD device demonstrates significantly higher responsivity and a superior ability to emulate a wide range of synaptic properties compared to previously reported Si-based and 2D material/QD-based devices. An artificial neural network trained on the Fashion MNIST dataset achieved over 85% accuracy, which is higher than previous reports. This showcases the potential of retina-inspired SWIR optoelectronic devices for compact, efficient machine vision and in-sensor computing. This study underscores the potential of integrating QDs with 2D materials to create advanced photodetectors that mimic biological sensory functions.
生物系统在低功耗和快速响应的图像识别方面表现出色。受人类眼睛的启发，研究人员开发了固态人工视觉系统。在本研究中，基于二硒化钨（WSe₂）/砷化铟量子点（InAs QD）异质结构开发了一种视网膜形态人工突触器件。该器件在1060 nm处表现出增强的短波红外（SWIR）响应性，这是一种类似于人类视网膜的突触行为。WSe₂/InAs QD通过InAs量子点的量子限制效应改善了电荷传输和光子吸收，有助于高效的SWIR检测。异质结实现了有效的电子-空穴对分离，提高了光电探测器的性能。该器件像人眼适应光闪烁一样适应SWIR信号脉冲。与先前报道的基于硅和基于二维材料/量子点的器件相比，WSe₂/InAs QD器件表现出显著更高的响应性和模拟广泛突触特性的卓越能力。在Fashion MNIST数据集上训练的人工神经网络实现了超过85%的准确率，高于先前的报道。这展示了受视网膜启发的SWIR光电器件在紧凑、高效的机器视觉和传感器内计算方面的潜力。这项研究强调了将量子点与二维材料集成以创建模仿生物感官功能的先进光电探测器的潜力。
