Abstract
We employed a rudimentary technique of solution chemistry to synthesize ZnO nanostructures of various sizes. The crystal structure and bond alignment were studied through X-ray diffraction technique. Raman and Fourier Transformed Infra-Red Spectroscopy and Transmission Electron Microscopy were employed to reveal the morphology and the formation of core–shell nanostructures. We observed that ZnO4 tetrahedral distortion and nano-confinement impart c-axial evolution of structure. The quantum confinement of the core resulted in extreme blue-shifted photoluminescence. The experimental value of energy band gap was validated by a quantum mechanical approach with effective mass approximation. We also observed ~900% increase in current under illumination as compared to dark current. The wide band photoluminescence and enhanced photocurrent are suitable for the application in white-light emitting diodes, photo-detectors and solar cells.
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