High-Performance KV${}_3$Sb${}_5$/WSe${}_2$ van der Waals Photodetectors

Abstract

Kagome metals AV${}_3$Sb${}_5$ (A = K, Rb, Cs) have recently emerged as a promising platform for exploring correlated and topological quantum states, yet their potential for optoelectronic applications remains largely unexplored. Here, we report high-performance photodetectors based on van der Waals KV${}_3$Sb${}_5$/WSe${}_2$ heterojunctions. A high-quality Schottky interface readily forms between KV${}_3$Sb${}_5$ and WSe${}_2$, enabling efficient separation and transport of photoinduced carriers. Under 520 nm illumination, the device achieves an open-circuit voltage up to 0.6 V, a responsivity of 809 mA/W, and a fast response time of 18.3 us. This work demonstrates the promising optoelectronic applications of Kagome metals and highlights the potential of KV${}_3$Sb${}_5$-based van der Waals heterostructures for high-performance photodetection.

16 pages including Supporting Information