For 0.25M concentration, the band shape obtained is related to metal oxide bonds and can be attributed to the vibrational assignment of Zn–O bond [22]. In the case of 0.5M concentration, the spectra of ZnO and 1-Ca:ZnO films are defined only by absorption bands from 430–400cm−1 spectral domain, suggesting a complete process was achieved based on to the presence of Zn–O bonds. Moreover, the 5-Ca:ZnO spectrum in 430–400cm−1 domain displays the peaks assigned to the formation of Zn–O bonds. For all doped films the presence of dopant cannot be detected due to the fact that Ca–O bond overlaps with the Zn–O spectral bands in that particular region. However, in the case of the doped films at 0.5M concentration a slight shift to lower wavenumbers was observed due to the difference between bond lengths when Ca2+ ion replaces Zn2+ ion.
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