High-Performance KV₃Sb₅/WSe₂ Van Der Waals Photodetectors

Kagome metals AV₃Sb₅ (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 KV₃Sb₅/WSe₂ heterojunctions. A high-quality Schottky interface readily forms between KV₃Sb₅ and WSe₂, 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⁻¹, and a fast response time of 18.3 µs. This work demonstrates the promising optoelectronic applications of Kagome metals and highlights the potential of KV₃Sb₅-based van der Waals heterostructures for high-performance photodetection.