Enhanced UV emission of Li-Y co-doped ZnO thin films via spray pyrolysis

摘要: Abstract Pure ZnO and ZnO: 2%Y: x%Li (x = 0, 3, 5 7 at.%) thin films have been successfully prepared onto glass substrates under optimized conditions by spray pyrolysis technique at 450 °C their suitability for the fabrication of efficient optoelectronic devices is demonstrated. The samples characterized X-ray diffraction (XRD), Scanning electron microscopy (SEM), UV–Visible absorption spectroscopy photoluminescence (PL) Raman (RS), in order to investigate effect Y–Li co-doping on structure, surface morphology, optical features films. crystallized into a hexagonal with preferred orientation along c-axis. No additional phases observed. SEM micrographs showed that Y Li plays key role grain size morphology study via transmittance measurements within UV–vis region revealed are highly transparent (82–90%). bandgap (Eg) depends concentration lithium added, which explained Burstein-Moss (BM) effect. PL room temperature excitation 325 nm wavelength, an appreciable improvement ultraviolet emission increasing concentration. This enhancement reaches maximum 5 at.% content, decreases after further increase content. scattering spectra were also carried out presence wurtzite phase exclusively.