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Published in:
01-08-2013
Effect of Cu additions on morphology and optical properties of ZnO nanorod arrays by two-step method
Published in: Journal of Materials Science: Materials in Electronics | Issue 8/2013
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Abstract
ZnO, Zn0.9Cu0.1O, Zn0.8Cu0.2O and Zn0.7Cu0.3O nanorod arrays are produced via a two-step process including an initial sol–gel method followed by hydrothermal growth. Effects of the Cu on microstructure, surface topography and optical properties of the nanorod arrays were studied and discussed. The results indicate that the nanorod arrays with a highly preferred orientation along the c axis were obtained on glass substrate. The Zn0.7Cu0.3O possesses the maximum density of nanorod arrays of 6.0 × 109 cm−2. The optical band-gap energy E
g
decreases first and then increases with Cu additions increase. The broadening of the optical band-gap can be explained by Moss–Burstein effect. The Cu additions will effective enhance the violet emission and suppress the green emission. The violet and green emissions are likely due to the electron transition from the localized level below conduction band and oxygen vacancy to the valance band.