Study of electrical properties of a few layers of graphene sheets under Ultraviolet and Visible light irradation

Abstract

Graphene is an excellent 2D material due to its exceptional electrical properties which can be potentially used in optoelectronic. In order to use graphene in optoelectronics, the electrical properties need to be tuned. To tune electrical properties, few-layer graphene sheets (FLGS) prepared by electrochemical method have been used. The prepared FLGS has been characterized by Field Emission Scanning Electron Microscope (FESEM), Transmission Electron Microscope (TEM), X-ray Diffraction (XRD), Ultraviolet-Visible Spectroscopy (UV-Vis), Fourier Transform Infrared (FTIR), and Raman Spectroscopy. The optimized FLGS by characterization has been employed to tune the electrical properties in the presence and absence of water drop under ultraviolet and visible light. The obtained current of FLGS thin film is ~ 0.8mA whereas; the measured current under ultraviolet light is ~ 1.7mA and under visible light ~ 1.07mA. However, it has been observed that the measured current has decreased to under ultraviolet ~ 0.645mA and visible light ~ 0.96mA in the presence of water drop in FLGS film. Therefore, the findings suggest that the electrical properties of FLGS can be tuned for various applications in optoelectronic devices.