Control growth of catalyst-free high-quality ZnO nanowire arrays on transparent quartz glass substrate by chemical vapor deposition

▶ Morphology-controllable ZnO nanowire arrays on transparent quartz glass substrate have been successfully synthesized by a simple chemical vapor deposition technique. The results indicated that the evaporation temperature and the buffer layer play important roles on controlling the morphology. A proper growth temperature, 480 °C and thicker buffer layer 40 nm in this work result in the ZnO nanowire arrays of the best alignment and density. The room-temperature photoluminescence spectrum showed that the buffer layer has also great effects on optical properties of ZnO nanowire arrays. The integrated intensity ratio [IUV/IVisible band] of the ZnO UV emission peak to visible band emission decreases with the increasing thickness. The obtained nanowire arrays have transmittance of above 50% in the visible region.