2D CuInP₂Se₆ in High-Sensitivity UV-vis And X-Ray Detection

Metal thio(seleno)phosphates are renowned for their multifaceted physical characteristics and versatile applications, particularly in optoelectronics. In detection applications, a low and stable dark current is crucial, enhancing the sensitivity and signal-to-noise ratio of detectors. Herein, a van der Waals layered material has synthesized, CuInP2Se6. Despite its nanometric scale, 2D CuInP2Se6 detector transcends the conventional absorption inefficiencies tied to ultrathin materials. It delivers exceptional ultraviolet-visible detection, characterized by an ultralow, stable dark current of 150 fA, and a noise power density of 27.7 fA Hz(-1/2) at room temperature. The in-depth investigation reveals a responsivity of 4.47 A W-1, an external quantum efficiency of 1369%, a special detectivity of 1.44 x 10(13) Jones, and a rapid response speed of 280 mu s, positioning it at the pinnacle of 2D photodetector performance. The CuInP2Se6's ultralow, stable dark current paves the way for X-ray detection, achieving an unprecedented sensitivity of 1.32 x 10(5) mu C Gy(air)(-1) cm(-2) and a low detection limit of 0.15 mu Gy(air) s(-1). Furthermore, 2D CuInP2Se6 detector exhibits a remarkable image-sensing capability, adeptly capturing intricate patterns with high resolution. This discovery indicates its promise in revolutionizing integrated micro/nano optoelectronic devices, opening avenues for advancements in light and X-ray detection and imaging technologies.