ZnO thin film and nanorods array have been synthesized by RF magnetron sputtering and low temperature wet chemical method, respectively. It is followed by deposition of Cu nanosheet using DC magnetron sputtering, which was oxidized subsequently to form 2D and 3D ZnO/CuO heterointerfaces. A successful fabrication of heteroepitaxial ZnO–CuO thin film was presented to improve the interface quality, crystallinity and conformal characteristic of CuO sheet. ZnO/CuO thin film revealed higher absorption efficiency in the visible region in comparison to pure ZnO. The rectifying behavior of n-ZnO/p-CuO junction could be useful in photoactive and photoconductive devices, while the uni-polar transport of p-CuO/n-ZnO thin film is beneficial for optical switching. This photoactivity attributed to extended light absorption and effective transfer of photogenerated carriers. The as-synthesized ZnO–Cu composite was determined to be a hierarchical heterostructure consisting of ZnO nanorods and Cu nanosheets with intimate hetero-interfaces. The formation of n+-Cu/n-ZnO heterointerface cause to electrostatic field which facilitates electron emission.
Journal of Materials Science: Materials in Electronics – Springer Journals
Published: May 26, 2017
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