All‐in‐One 2D Molecular Crystal Optoelectronic Synapse for Polarization‐Sensitive Neuromorphic Visual System

• Published in: Advanced materials (Weinheim) 2024-10, Vol.36 (40), p.e2409550-n/a
• Main Authors: Dong, Meiqiu, Zhang, Yu, Zhu, Jie, Zhu, Xiaoting, Zhao, Jinjin, Zhao, Qiang, Sun, Lingjie, Sun, Yajing, Yang, Fangxu, Hu, Wenping
• Format: Article
• Language: English
• Subjects: 2D molecular crystals; Biometric recognition systems; Functionals; Optoelectronic devices; organic semiconductors; phototransistors; Polarization; polarization‐sensitive synapses; Polarized light; Synapses
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.202409550

Neuromorphic visual systems (NVSs) hold the potential to not only preserve but also enhance human visual capabilities. One such augmentation lies in harnessing polarization information from light reflected or scattered off surfaces like bees, which can disclose unique characteristics imperceptible to the human eyes. While creating polarization‐sensitive optoelectronic synapses presents an intriguing avenue for equipping NVS with this capability, integrating functions like polarization sensitivity, photodetection, and synaptic operations into a singular device has proven challenging. This integration typically necessitates distinct functional components for each performance metric, leading to intricate fabrication processes and constraining overall performance. Herein, a pioneering linear polarized light sensitive synaptic organic phototransistor (OPT) based on 2D molecular crystals (2DMCs) with highly integrated, all‐in‐one functionality, is demonstrated. By leveraging the superior crystallinity and molecular thinness of 2DMC, the synaptic OPT exhibits comprehensive superior performance, including a linear dichroic ratio up to 3.85, a high responsivity of 1.47 × 104 A W−1, and the adept emulation of biological synapse functions. A sophisticated application in noncontact fingerprint detection achieves a 99.8% recognition accuracy, further highlights its potential. The all‐in‐one 2DMC optoelectronic synapse for polarization‐sensitive NVS marks a new era for intelligent perception systems. A pioneering all‐in‐one 2D molecular crystal (2DMC) optoelectronic synapse for polarization‐sensitive neuromorphic visual system is demonstrated. The synaptic phototransistor exhibits remarkable photoelectric performance and simulates biological synapse functions. The in‐plane crystal anisotropy of 2DMC endows the synaptic phototransistor with polarization perception capabilities, which is successfully applied to noncontact fingerprint detection with a high recognition accuracy.