Photodetection‐Photosynapse Multimodal Integrated Device for Synergistic Applications in Encrypted Optical Communication and Image Processing
Tongzhou Wei, Haohong Jiang, Yuanhong Hu, Qiaoming Zhang, Liangqin Zeng, Junjie Guo, Lixiang Chen, Xingwen Tan, Ping Chen, Yanlian Lei
Abstract
Abstract Integrating photodetector and photosynapse functions into a single device is crucial for advancing image perception in neuromorphic visual systems. However, the disparity in response speeds between these functionalities poses significant challenges for multimodal integration. Here, a multimodal optoelectronic device is presented based on a copper(I) thiocyanate (CuSCN)/poly(N‐vinylcarbazole) (PVK):Y6 composite heterojunction, achieving ultraviolet (UV)‐detection, UV‐synapse, and near‐infrared (NIR)‐detection modes. The device allows seamless switching between modes by precisely tuning the operational voltage and/or adjusting the excitation light wavelength. The charge trapping at the CuSCN/PVK interface, coupled with the controllable movement of photogenerated carriers, enables this multimodal operation. Most importantly, through the synergistic interaction between modes, two optoelectronic applications are demonstrated: frequency‐selective photoresponse for encrypted optical communications and NIR‐assisted enhancement for image recognition. This work not only provides a straightforward method for multimodal operation within a single device but also highlights the potential for synergistic applications in artificial vision systems.