High performance UV photodetector based on 2D non-layered CuGaS₂ nanosheets

In this work, for the first time, two-dimensional (2D) non-layered CuGaS₂ nanosheets synthesized via solid-state reaction and high performance UV photodetector based on 2D non-layered CuGaS₂ were demonstrated. The synthesized 2D CuGaS₂ shows a good crystallinity and strong optical absorption in UV light region with a direct bandgap of 2.4 eV. 2D CuGaS₂ photodetector shows an obvious photoresponse for UV lights (254 nm and 365 nm). The responsivity and detectivity values of 2D CuGaS₂ photodetector are 5.1 A W⁻¹ and 1.67 × 10¹¹ Jones for 254 nm light (P = 0.29 mW cm⁻², S = 300 μm²), respectively. Our results demonstrate that 2D non-layered CuGaS₂ is a promising candidate for application in UV photodetection devices. (paper)