TY - JOUR
T1 - Stabilization of the surface of ZnO films and elimination of the aging effect
AU - Abdullin, Khabibulla A.
AU - Gabdullin, Maratbek T.
AU - Zhumagulov , Sultan K.
AU - Ismailova , Guzal A.
AU - Gritsenko , Lesya V.
AU - Kedruk, Yevgeniya Y.
AU - Mirzaeian, Mojtaba
PY - 2021/10/30
Y1 - 2021/10/30
N2 - 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 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.
AB - 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 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.
KW - ZnO
KW - chemical bath deposition
KW - hydrogen plasma treatment
KW - aging effect
KW - surface stabilization
UR - http://www.scopus.com/inward/record.url?scp=85118569705&partnerID=8YFLogxK
U2 - 10.3390/ma14216535
DO - 10.3390/ma14216535
M3 - Article
SN - 1996-1944
VL - 14
JO - Materials
JF - Materials
IS - 21
M1 - 6535
ER -