Study of the Effect of Doping with Barium on Some Optical Properties of Thin Films of Copper Oxide Prepared by Sol-Gel Technique

Abstract

 Thin films of CuO were prepared using Sol-Gel technology, and we depended on the spin coating method at an angular speed of 2000 rpm. Then, the barium-doped films were prepared according to the weight ratios (6%, 9%, 12%) wt, and the films were heat treated at 600°C degrees. for an hour, and the formation of the copper oxide structure was confirmed by XRD spectroscopy, which showed that the formed copper oxide was polycrystalline and that the preferred crystal orientation was (111) as the structure was monoclinic. Through UV-VIS spectroscopy, in the wavelength range (280-900)nm. 

 The transmittance of the pure film ranged between (54.3%-59.72%) and the doping with barium at 12%wt increased the transmittance to 62.175%, and the transmittance increased with the increase in the dopant percentage, and the value of the energy gap for the direct transfers of the pure film was 3.83eV. The doping with barium increased the value of the direct energy gap to reach a maximum value of 4.25eV at 9%wt doping.