Stabilization of the surface of zno films and elimination of the aging effect
Abdullin K.A. Gabdullin M.T. Zhumagulov S.K. Ismailova G.A. Gritsenko L.V. Kedruk Y.Y. Mirzaeian M.
November-1 2021MDPI
Materials
2021#14Issue 21
Zinc oxide is a promising multifunctional material. The practical use of nano-and polycrys-talline ZnO devices faces a serious problem of instability of electrical and luminescent characteristics, due to the adsorption of oxygen by the surface during aging. In this paper, the aging effect in ZnO films and nanorod arrays was studied. It was found that ZnO samples demonstrate different behavior of the degradation process, which corresponds to at least two different types of adsorbing surface sites for O2, where O2 adsorption is of a different nature. The first type of surface sites is rapidly depassivated after hydrogen passivation and the aging effect takes place due to these centers. The second type of surface sites has a stable structure after hydrogen passivation and corresponds to HO–ZnO sites. The XPS components of these sites include the Zn2p3/2 peak at 1022.2 ± 0.2 eV and Zn2p1/2 peak at 1045.2 ± 0.2 eV, with a part of the XPS O1s peak at 531.5 ± 0.3 eV. The annealing transforms the first type of site into the second one, and the subsequent short-term plasma treatment in hydrogen results in steady passivation, where the degradation of characteristics is practically reduced to zero.
Aging effect , Chemical bath deposition , Hydrogen plasma treatment , Surface stabilization , ZnO
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Department of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi Ave. 71, Almaty, 050040, Kazakhstan
Institute of Applied Science & Information Technology, Shashkin Str. 40–48, Almaty, 050040, Kazakhstan
Kazakh-British Technical University, Almaty, 050000, Kazakhstan
School of General Education, Satbayev University, Almaty, 050013, Kazakhstan
School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, United Kingdom
Department of Physics and Technology
Institute of Applied Science & Information Technology
Kazakh-British Technical University
School of General Education
School of Computing
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