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Dark color ZnO quasi-one-dimensional nanostructures grown by hydrothermal method and the modulation of their optical properties
Fa-qiang Xu
作者单位E-mail
Fa-qiang Xu National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China fqxu@ustc.edu.cn 
摘要:
Zinc oxide has a large energy gap and thus it has potential in absorbing the energy of the full spectrum light, which has a bright prospect of improving the efficiency of using solar energy. In order to enhance its absorption of sunlight, dark color zinc oxides have been prepared by traditional hydrothermal method directly using a zinc foil as both source and substrate. We found that we could tune the optical properties of ZnO samples by changing the temperature. In particular, increasing temperature could significantly reduce the reflectivity of solar energy in visible range. We speculate that the phenomenon is relevant to the sharp cone morphology of the ZnO nanorods grown on the surface of Zn foils, furthermore which enhanced refraction and reflection of light in nanorods. The capacity to improve the light absorption of ZnO may have a bright application in raising efficiency of solar cells.
关键词:  hydrothermal method, dark color ZnO samples, enhanced optical properties
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Dark color ZnO quasi-one-dimensional nanostructures grown by hydrothermal method and the modulation of their optical properties
Fa-qiang Xu
Abstract:
Zinc oxide has a large energy gap and thus it has potential in absorbing the energy of the full spectrum light, which has a bright prospect of improving the efficiency of using solar energy. In order to enhance its absorption of sunlight, dark color zinc oxides have been prepared by traditional hydrothermal method directly using a zinc foil as both source and substrate. We found that we could tune the optical properties of ZnO samples by changing the temperature. In particular, increasing temperature could significantly reduce the reflectivity of solar energy in visible range. We speculate that the phenomenon is relevant to the sharp cone morphology of the ZnO nanorods grown on the surface of Zn foils, furthermore which enhanced refraction and reflection of light in nanorods. The capacity to improve the light absorption of ZnO may have a bright application in raising efficiency of solar cells.
Key words:  hydrothermal method, dark color ZnO samples, enhanced optical properties