Self-powered and broadband opto-sensor with bionic visual adaptation function based on multilayer γ-InSe flakes
Weizhen Liu, Xuhui Yang, Zhongqiang Wang, Yuanzheng Li, Jixiu Li, Qiushi Feng, Xiuhua Xie, Wei Xin, Haiyang Xu, Yichun Liu
Abstract
Visual adaptation that can autonomously adjust the response to light stimuli is a basic function of artificial visual systems for intelligent bionic robots. To improve efficiency and reduce complexity, artificial visual systems with integrated visual adaptation functions based on a single device should be developed to replace traditional approaches that require complex circuitry and algorithms. Here, we have developed a single two-terminal opto-sensor based on multilayer γ-InSe flakes, which successfully emulated the visual adaptation behaviors with a new working mechanism combining the photo-pyroelectric and photo-thermoelectric effect. The device can operate in self-powered mode and exhibit good human-eye-like adaptation behaviors, which include broadband light-sensing image adaptation (from ultraviolet to near-infrared), near-complete photosensitivity recovery (99.6%), and synergetic visual adaptation, encouraging the advancement of intelligent opto-sensors and machine vision systems.