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.