Fig. 3 shows the UV–vis transmission spectra of the Mg-doped
ZnO thin films annealed at 873 K with different Mg concentrations.
In this study, the absorbance of samples was measured as a function
of wavelength in the range of 300–800 nm. It can be seen that all
the thin films have an average optical transparency over 85% in the
visible range and a sharp ultraviolet absorption edges.