TY - JOUR
T1 - Growth behaviors and characteristics of low temperature spin-sprayed ZnO and Al-doped ZnO microstructures
AU - Obi, Ogheneyunume
AU - Zhou, Ziyao
AU - Beghun, Shawn
AU - Nan, Tianxiang
AU - Stoute, Stephen
AU - Liu, Ming
AU - Lou, Jing
AU - Yang, Xi
AU - Gao, Yuan
AU - Li, Ming
AU - Xing, Xing
AU - Sun, Nian X.
AU - Warzywoda, Juliusz
AU - Sacco, Albert
AU - Guo, Ting
AU - Nan, Cewen
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/6
Y1 - 2013/6
N2 - The influence of growth parameters of the spin-spray technique upon the microstructure and electrical and optical properties of ZnO and Al-doped ZnO microstructures was investigated. This investigation was carried out by varying the pH and concentration of the solutions utilized. With increasing pH from 9 to 12, the ZnO films changed from membrane-like microstructures at a pH of 9 to single crystal ZnO rods with hexagonal ends at the pH of 10, and to polycrystal ZnO needle-like tips with random crystalline orientation at the pH of 12. Varying the concentration of the solution brought about a dramatic change in the crystal growth behavior and crystalline orientation, with the least concentration producing rods more uniform and oriented in the c-axis direction. The optical absorption dependence of the ZnO microstructures was also studied by ultraviolet visible spectrophotometer. This investigation will enable optimized low temperature (<100 C) fabrication of ZnO films by the spin-spray technique with controllable microstructure and properties based on their processing conditions. Furthermore, the influence of Al doping on the electric property, optical property microstructures of the Al-doped ZnO thin films was examined. Increase in Al concentration from 0 to 2 % further reduced the resistivity of the ZnO films by 3 orders of magnitudes from 3.4 × 10 4 to 14 Ω cm; while the Hall mobility increases from 1 to 140 cm2/V s at the same time. The optical photoluminescence measurement of Al-doped ZnO thin films in ultra violet (UV) was also demonstrated.
AB - The influence of growth parameters of the spin-spray technique upon the microstructure and electrical and optical properties of ZnO and Al-doped ZnO microstructures was investigated. This investigation was carried out by varying the pH and concentration of the solutions utilized. With increasing pH from 9 to 12, the ZnO films changed from membrane-like microstructures at a pH of 9 to single crystal ZnO rods with hexagonal ends at the pH of 10, and to polycrystal ZnO needle-like tips with random crystalline orientation at the pH of 12. Varying the concentration of the solution brought about a dramatic change in the crystal growth behavior and crystalline orientation, with the least concentration producing rods more uniform and oriented in the c-axis direction. The optical absorption dependence of the ZnO microstructures was also studied by ultraviolet visible spectrophotometer. This investigation will enable optimized low temperature (<100 C) fabrication of ZnO films by the spin-spray technique with controllable microstructure and properties based on their processing conditions. Furthermore, the influence of Al doping on the electric property, optical property microstructures of the Al-doped ZnO thin films was examined. Increase in Al concentration from 0 to 2 % further reduced the resistivity of the ZnO films by 3 orders of magnitudes from 3.4 × 10 4 to 14 Ω cm; while the Hall mobility increases from 1 to 140 cm2/V s at the same time. The optical photoluminescence measurement of Al-doped ZnO thin films in ultra violet (UV) was also demonstrated.
UR - http://www.scopus.com/inward/record.url?scp=84878725495&partnerID=8YFLogxK
U2 - 10.1007/s10854-012-1056-3
DO - 10.1007/s10854-012-1056-3
M3 - Article
AN - SCOPUS:84878725495
VL - 24
SP - 2058
EP - 2066
JO - Journal of Materials Science: Materials in Electronics
JF - Journal of Materials Science: Materials in Electronics
SN - 0957-4522
IS - 6
ER -