Papier de Joao Resende 2019

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" This study reports the influence of magnesium incorporation into cuprous oxide (Cu₂O) on its transformation into cupric oxide (CuO). Thermal treatments under oxidizing conditions are performed on undoped and magnesium-doped cuprous oxide thin films, Cu₂O and Cu₂O:Mg respectively, deposited by aerosol-assisted metal–organic chemical vapor deposition. The oxidation kinetics of these films shows a slower rate in the Cu₂O:Mg system, since the complete oxidation into CuO occurs at a higher temperature when compared with undoped Cu₂O. The increased stability of Cu₂O:Mg can be explained by the inhibition of the formation of split copper vacancies, the defect most frequently associated with the CuO nucleation. Annealing treatments performed on Cu₂O thin films provide new insights on the dopant influence on the mechanism to generate simple and split copper vacancies as well as the transformation of Cu₂O into CuO. "