Abstract
Hexagonal zinc oxide nanotetrapods structures were grown on p-type Si substrates by the simple vapour-solid technique without the presence of any catalysts. Field emission scanning electron microscopy and X-ray diffraction techniques were used to study the morphologies and crystal structures of these tetrapod-shaped ZnO nanocrystals. The photoluminescence measurements of ZnO tetrapods exhibited UV peak at 380nm corresponding to the free exciton emission, and a broad peak at about 506nm arising out of defect related emission from surface of the nanocrystals. Furthermore, temperature dependent photoluminescence characteristics of ZnO tetrapods have been investigated and origin of LO phonon emission is explained in terms of both bound and free excitons. Current–voltage (I–V) characteristics of the ZnO tetrapods devices were analysed, and they exhibited growth-temperature dependent electrical property. Depending on the density of grown nanostructures the I–V of the ZnO/p-Si heterostructure was varied from Ohmic to rectifying behaviour and current transport mechanism is found to follow space charge limited current.
Published Version
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