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.