Abstract
Vertically aligned ZnO nanorods grown on (100) Si substrates have been found to have a polycrystalline zinc oxide underlayer. After etching in a hydrochloric acid solution, the nanorods had smaller dimensions and pointed ends. As shown by exciton spectroscopy, the nanorods had a higher structural perfection and better luminescent properties in comparison with the underlayer. The 4.2-K luminescence spectra of the nanorods exhibit violet emission due to bound and interacting excitons. The low-temperature edge emission of the ZnO underlayer is shown to consist of lines due to electron-hole plasma recombination.
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