Type-II WS2/AsP Van der Waals Heterojunctions with High Rectification Ratio and High Detectivity Photodetectors based on two-dimensional materials have attracted significant attention due to their unique structure and outstanding optoelectronic properties. However, large dark current and extended response time have become bottlenecks for further practical application. In this work, a WS2/AsP van der Waals heterojunction (vdWHs) with a type-II band structure has been fabricated.