Effect of Co doping on optical properties of chemically synthesized delafossite structured CuCrO_2 thin film

摘要

In this communication, thin films of delafossite structured oxide material of CuCrO_2 with different concentration of cobalt (0%, 1%, 2% and 3%) have been grown on quartz substrate by sol-gel spin coating method. Prepared films were annealed at 800 °C in ambient condition for 5 hours. The microstructure, surface topography and optical properties of as prepared Co doped CuCrO_2 thin films were analyzed by using X-ray diffractometer (XRD) with Cu-Kα radiation, Atomic Force Microscopy (AFM) and UV-Vis NIR photospectrometer respectively. Maximum transparency was found to be 50% from transmittance spectra. Red shifts of optical energy band gap have been observed due to increase of carrier concentration of cobalt in CuCrO_2 thin films. The doping of cobalt in CuCrO_2 thin films have a significant influence on the optical properties of CuCrO_2 which can be used to shape up smart semiconductor devices.