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 ⁻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 KV ₃ Sb ₅ ‐based van der Waals heterostructures for high‐performance photodetection.