ZnO films/nanorods have been prepared by chemical bath deposition using a mixed solvent. Precoated ZnO thin seed layers played a key role in the growth of ZnO films/nanorods. The crystallite orientation in the films was successfully controlled by varying the volume ratio of water to ethanol. Films consisting of highly oriented nanorod arrays with the c-axis perpendicular to the substrate were fabricated in aqueous solution. The crystals became increasingly tilted as more ethanol was introduced to the solution, resulting in the formation of dense films by the coalescence between adjacent crystals across the whole film surface. The dense films consisting of crystals with a large smooth facet exhibited a markedly enhanced reflectance. The exclusive UV emission in the photoluminescence (PL) spectra indicated a high crystal quality of the prepared ZnO films/nanorods.
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