Stabilization of the Surface of ZnO Films and Elimination of the Aging Effect

Materials

Sultan K. Zhumagulov¹  Khabibulla A. Abdullin¹  Guzal A. Ismailova¹  Maratbek T. Gabdullin²  Mojtaba Mirzaeian³  Yevgeniya Y. Kedruk⁴  Lesya V. Gritsenko⁴ 

[1] Department of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi Ave. 71, Almaty 050040, Kazakhstan;Kazakh-British Technical University, Almaty 050000, Kazakhstan;School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UK;School of General Education, Satbayev University, Almaty 050013, Kazakhstan;

关键词: ZnO;    chemical bath deposition;    hydrogen plasma treatment;    aging effect;    surface stabilization;   

DOI  :  10.3390/ma14216535

来源: DOAJ

【 摘 要 】

Zinc oxide is a promising multifunctional material. The practical use of nano- and polycrystalline 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 Zn2p_3/2 peak at 1022.2 ± 0.2 eV and Zn2p_1/2 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.

【 授权许可】

Unknown