Growth of ZnO nanostructures produced by MOCVD. A study of the effect of the substrate

A study of the influence of the substrate mismatch on the growth of ZnO nanostructures is reported. ZnO nanostructures are deposited, by a simple catalyst-free metal-organic (MO)CVD approach, onto various substrates, such as SrTiO3(100), Si(100), and Al2O3(0001), using a novel diamine adduct of zinc bis-2 thenoyl-trifluoroacetonate (Zn(tta)(2) center dot tmeda, Htta = CF3COCH2-COC4H3S, tmeda = N,N,N',N'-tetramethylethylenediamine). Structural characterizations indicate that both morphology and crystalline structure of the obtained ZnO nanostructured systems strongly depend upon the crystalline mismatch with the substrate. Room-temperature cathodoluminescence (CL) spectroscopy is used to characterize the optical properties of the various nanostructures. The resulting cathodoluminescence spectra of all the samples show the presence of a strong and broad green band around 2.4eV.