Author(s): Huang, LT (Huang, Liting); Zhu, ZW (Zhu, Zhaowei); Cheng, CT (Cheng, Chuantong); Gao, Y (Gao, Y.)

Source: NANOTECHNOLOGY Volume: 35  Issue: 36  Article Number: 365202  

DOI: 10.1088/1361-6528/ad4b25  Published Date: 2024 SEP 2  

Abstract: Long term stability, high responsivity, and fast response speed are essential for the commercialization of graphene photodetectors (GPDs). In this work, a parylene/graphene UV photodetector with long term stability, ultrahigh responsivity and fast response speed, is demonstrated. Parylene as a stable physical and chemical insulating layer reduces the environmental sensitivity of graphene, and enhances the performances of GPDs. In addition, utilizing bilayer electrodes reduces the buckling and damage of graphene after transferring. The parylene/graphene UV photodetector exhibits an ultrahigh responsivity of 5.82 x 105 AW-1 under 325 nm light irradiation at 1 V bias. Additionally, it shows a fast response speed with a rise time of 80 mu s and a fall time of 17 mu s, and a long term stability at 405 nm wavelength which is absent in the device without parylene. The parylene/graphene UV photodetector possesses superior performances. This paves the way for the commercial application of the high-performance graphene hybrid photodetectors, and provides a practical method for maintaining the long term stability of two dimensional (2D) materials.