Two-in-one functionality in a 28 × 28 β-Ga <sub>2</sub> O <sub>3</sub> array: bias-voltage switching between photodetection and neuromorphic vision
Xiang Wang, Lingfei Li, Haoxuan Peng, Yingxu Wang, Lingyun Zhang, Yan Gu, Xiaobo She, Maolin Zhang, Yufeng Guo, Yu Liu
Abstract
Due to the differences in photoresponse characteristics between photodetectors and neuromorphic vision sensors (NVS), simultaneously achieving these two powerful functionalities on a single device poses significant challenges. Here, we demonstrate a two-in-one platform based on a 28 × 28 β -Ga 2 O 3 array that seamlessly switches between photodetector and NVS modes via bias voltage control. By exploiting the differential carrier capture dynamics of deep-level oxygen vacancies in Ga 2 O 3 , our device exhibits conventional photoconductivity at low voltages and persistent photoconductivity at high voltages. This enables high-quality optoelectronic imaging as well as excellent image sensing, memory, and neuromorphic visual preprocessing capabilities within a single integrated platform. This work paves the way for multifunctional Ga 2 O 3 optoelectronic devices with applications in integrated sensing and computing.