 Abstract this paper presents a new Type II heterojunction photodetector based on CUZNS and GA-203 materials. It is found that the device exhibits superior performance with respect to responsivity, detectivity, and self-powered operation. This work demonstrates the potential of this material system for applications in ultra-high-performance self-powered, solar-blind photodetectors. This article was authored by Zhu and Qian Lv, Xiqi Yan, Wenxiang Mu, and others.