Comprehensive analysis of hybrid Si/MoS2-PVA:CuO nanofiber heterojunctions: Achieving self-powered photodetection in UV-Vis-NIR region

Herein, CuO nanoparticles were synthesized via chemical deposition and combined with MoS2 nanosheets and PVA polymer to create a composite. To ensure the integrity of the MoS2-PVA:CuO nanofibers, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and energy-dispersive X-ray spectroscopy (EDS) analyses were performed. An excellent rectifier MoS2-PVA:CuO@Si heterojunction device with a dark rectification ratio of 1.24 x 10(5) was fabricated by electrospinning MoS2-PVA:CuO composite onto n-Si wafer. The photoelectrical analysis of the photosensitive device under varying white light intensity as well as under UV, IR and yellow light with a light power of 8 mW/cm(2) was investigated in detail by I-V measurements. The perfect photoresponse of the device under all light sources was obtained. Specifically, R, D, and NEP of 3.53 A/W, 3.17 x 10(13) Jones, and 1.73 x 10(-15) respectively, were attained at 590 nm and 8 mW/cm(2) for the optimum values. The highest EQE value was calculated as 799 % under 365 nm UV light. Time-dependent stability measurements of the device were repeated after 24 and 124 days and showed superb stability even without any encapsulation.