Suhad A. Hamdan and Iftikhar M. Ali Department of Physics, College of Science, University of Baghdad
الملخص الانجليزي
In this work, Co-Y-oxide Nano Structure is successfully synthesized via hydrothermal
method. The XRD analysis, SEM analysis, optical, electrical and photo sensing properties
have been investigated for Co3O4 and Co-Y-oxide thin films. The X-ray diffraction (XRD)
analysis reveals that all films are polycrystalline in nature, having cubic structure. The
SEM images of thin films clearly indicates that Co3O4 possesses nanosphere like structure
and flower like for Co-Y-oxide. The optical properties show that the optical energy gap
follows allowed direct electronic transition calculated using Tauc equation and it increases
for Co-Y-oxide. The photo sensing properties of thin films are investigated as a function
of time at different wavelengths to find the sensitivity for these lights. For Co3O4, photo
sensitivities are 39.7% and 40% at wavelengths 470nm and 600nm respectively, while for
Co-Y-oxide, photo sensitivities are 84% and 111% for these wavelengths. So, higher
sensitivity is obtained for Co-Y-oxide with fast rise and fall times less than 1s.