Investigations of the optical properties of ZnO-metal oxide core-shell nanowire arrays for use in advanced optoelectronics

The structural and optical properties of ZnO-metal oxide core-shell structures were investigated and distinctive features were induced by the shell coatings. In particular, the photoluminescence of the ZnO nanowire cores can be enhanced or depleted by the shell, depending on the choice of shell material. The thickness of the shell was found to be a minor factor in comparison to the shell material, so very thin coatings may transform the properties of the native cores in core-shell nanostructures. A fundamental understanding of the effects of thin shell layers on the optical properties of nanomaterials will improve their stance in advanced applications such as photovoltaic devices.