(a) PL spectra at for annealed ZnO:Ge films with different and (b) intensities of the PL lines and their phonon replicas as a function of .
Normalized room-temperature PL spectra in the range of NBE emission. The inset shows the PL intensity and its FWHM as a function of .
(a) Resolved PL spectra of ZnO:Ge films with different at and (b) relative integrated densities of the resolved PL lines as a function of
(a) XPS spectra of Ge -core level for Ge-doped ZnO films and (b) relative integrated-intensity ratio of the deconvoluted XPS peaks, for as a function of .
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