Romeissa , NETTOURAbdenour , KABIR2026-01-152026-01-152025-11-12http://dspace.univ-skikda.dz:4000/handle/123456789/5733Transition metals TM (Co, Fe, and Mn) doping induced changes in structural and optical properties of spray deposited ZnO thin films has been studied using X-ray diffraction (XRD), Raman spectroscopy, ATR-FTIR spectroscopy, UV-visible spectroscopy, and photoluminescence spectroscopy (PL) respectively. As a function of TM molar ratio x, XRD patterns revealed a change of crystalline parameters depending on TM nature. For Co doping, Co3O4 and Zn(OH)2 secondary phases appeared for x=0.10. for Mn doping, secondary phases such as MnO2 and ZnMnO3 appeared for x=0.06 while for Fe doping, no secondary phase was observed. These results were evidenced by Raman spectroscopy and ATR-FTIR spectroscopy. For the three doping elements, the band gap energy of ZnO varied, as a function of TM molar ratio x depending on TM nature. For Co doping, the band gap energy of ZnCoO decreased from 3.45 eV, for x=0.00, to reach a minimal value of 2.67 eV for x=0.08. For Fe doping, the band gap energy of ZnFeO decreased to reach a minimum of 3.21 eV for x=0.04. Beyond this molar ratio, the band gap energy stabilized around 3.27 eV. However, for Mn doping, the band gap energy of ZnMnO increased to reach a maximum of 3.55 eV for x=0.06. The photoluminescence spectrum of ZnO presented two peaks: an ultraviolet emission peak around 375 nm and a near infrared emission peak around 754 nm. Photoluminescence properties of samples depend on the TM nature and the TM molar ratio x. For Fe doping, the intensity of these two peaks decreased as a function of Fe molar ratio. No other emission peaks were observed. For Co doping, the intensity of these two peaks decreased as a function of Co molar ratio, to completely disappear for x=0.10 leaving their place to a red emission peak attributed to Co based impurities. For Mn doping, the intensity of UV and NIR emission peaks decreased rapidly for x=0.02. for x=0.04 and x=0.06, these two emission peaks disappeared leaving their places for a violet, a blue, and a blue-green emissions attributed respectively to Mn ions, Zni et VZn.enspray pyrolysischaracterization of ZnMO (M=Mn, Co, Fe) thin filmsThesis