12 January 2005 Preparation and optical properties of ZnO films by cathodic electrodeposition
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ZnO films on polycrystaline Zn substrates were synthesized by cathodic electrodeposition from an aqueous solution composed only of 0.05M zinc nitrate maintained at 65°C. Their microstructures were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Photoluminescence (PL) spectra of ZnO thin films prepared at more positive potential (-0.6~-0.8V) show a bond exciton photoluminescence band and intensive broad emission band around 2.17 eV, and three longitudinal optical (LO) phonon replica peaks of the bound exciton around 3.34. When more negative potential (-1.0~-1.4V) was applied in electrodeposition process, ultraviolet (UV) emission bands disappeared. A weak shoulder peak at about 1.87 eV was observed for all samples. The results indicate that more positive electrodeposition potential favors the high quality ZnO film growth. Annealed ZnO films prepared at more positive electrodeposition potentials (-0.6V~-1.0V) exhibit the strong ultraviolet emission at 3.35eV and a negligibly weak deep level emission. Thermal treatment results in the enhancement and sharpening of the excitonic photoluminescence bands and decrease of the deep level emission. Thermal treatment also decreases the Eg of ZnO film prepared at -1.0V from 3.56eV to 3.29eV.
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Qingtao Wang, Guanzhong Wang, Bo Xu, Jiansheng Jie, Xinhai Han, and Qingxuan Yu "Preparation and optical properties of ZnO films by cathodic electrodeposition", Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); doi: 10.1117/12.579123; https://doi.org/10.1117/12.579123

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