Ultrasonic pulse echo technique was used to study cupric oxide (CuO)
thin films. CuO thin films were prepared using sol gel technique. They
were doped with Lithium (Li) (1%, 2% and 4%).
Thin films’ thickness (d) and band gap energy (Eg) were measured. In
addition, elastic moduli (longitudinal (L), shear (G), bulk (K) and
Young’s (E)) and Poisson’s ratio (v) were determined to estimate the
microstructure properties of the prepared films.
The study ameliorated the used transducers to overcome their dead zone
and beam scattering; wedges were developed. The results showed the
effectiveness of these wedges. They enhanced transducers’ sensitivity by
changing the dead zone, beam diameter, beam directivity and waves’
Also, the study noted that Li doping caused the improvement of CuO thin
films to be more useful in solar cell fabrication. Li-CuO thin films had
narrower band gap. Thus, they acquired a high quantum yield for the
excited carriers; also they gained more efficiency to absorb solar light.