High‐Contrast Bidirectional Optoelectronic Synapses based on 2D Molecular Crystal Heterojunctions for Motion Detection

• DOI: 10.1002/adma.202301468
• Publication Date: 2023-04-04T17:56:07Z
• Authors: Xiaoting Zhu; Changsong Gao; Yiwen Ren; Xianghong Zhang; Enlong Li; Congyong Wang; Fangxu Yang; Jishan Wu; Wenping Hu; Huipeng Chen
• Keywords: Neuromorphic engineering; Motion Detection; Ambipolar diffusion

Light-stimulated optoelectronic synaptic devices are fundamental compositions of the neuromorphic vision system. However, there still huge challenges to achieving both bidirectional behaviors under light stimuli and high performance. Herein, a bilayer 2D molecular crystal (2DMC) p-n heterojunction is developed achieve high-performance behaviors. The 2DMC heterojunction-based field effect transistor (FET) exhibit typical ambipolar properties remarkable responsivity (R) 3.58×104 A W-1 weak as low 0.008 mW cm-2 . Excitatory inhibitory successfully realized by same different gate voltages. Moreover, superior contrast ratio (CR) 1.53×103 demonstrated ultrathin high-quality heterojunction, which transcends previous synapses enables application for motion detection pendulum. Furthermore, network based on device detect recognize classic vehicles in road traffic with an accuracy exceeding 90%. This work provides effective strategy developing high-contrast shows great potential intelligent bionic future artificial vision.