Cao Hechun, Hu Tao, Zhang Jiyue, Zhao Dongyang, Chen Yan, Wang Xudong, Yang Jing, Zhang Yuanyuan, Tang Xiaodong, Bai Wei, Shen Hong, Wang Jianlu, Chu Junhao
Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, P. R. China.
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, No.500 Yutian Road, Shanghai, 200083, P. R. China.
Adv Sci (Weinh). 2024 Jun;11(22):e2400018. doi: 10.1002/advs.202400018. Epub 2024 Mar 19.
Mix-dimensional heterojunctions (MDHJs) photodetectors (PDs) built from bulk and 2D materials are the research focus to develop hetero-integrated and multifunctional optoelectronic sensor systems. However, it is still an open issue for achieving multiple effects synergistic characteristics to boost sensitivity and enrich the prospect in artificial bionic systems. Herein, electrically tunable Te/WSe MDHJs phototransistors are constructed, and an ultralow dark current below 0.1 pA and a large on/off rectification ratio of 10 is achieved. Photoconductive, photovoltaic, and photo-thermoelectric conversions are simultaneously demonstrated by tuning the gate and bias. By these synergistic effects, responsivity and detectivity respectively reach 13.9 A W and 1.37 × 10 Jones with 400 times increment. The Te/WSe MDHJs PDs can function as artificial bionic visual systems due to the comparable response time to those of the human visual system and the presence of transient positive and negative response signals. This work offers an available strategy for intelligent optoelectronic devices with hetero-integration and multifunctions.
由块状材料和二维材料构建的混合维度异质结（MDHJs）光电探测器（PDs）是开发异质集成和多功能光电传感器系统的研究重点。然而，要实现多种效应的协同特性以提高灵敏度并丰富人工仿生系统的前景，仍然是一个悬而未决的问题。在此，构建了电可调谐的碲化钨/硒化钨混合维度异质结光电晶体管，实现了低于0.1 pA的超低暗电流和10的大开关整流比。通过调节栅极和偏置，同时展示了光电导、光伏和光热发电转换。通过这些协同效应，响应度和探测率分别达到13.9 A/W和1.37×10 Jones，提高了400倍。碲化钨/硒化钨混合维度异质结光电探测器由于其与人类视觉系统相当的响应时间以及瞬态正负响应信号的存在，可作为人工仿生视觉系统。这项工作为具有异质集成和多功能的智能光电器件提供了一种可行的策略。
