The effect of hydrothermal growth temperature on preparation and photoelectrochemical performance of ZnO nanorod array films |
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Authors: | Min Guo Peng Diao Shengmin Cai |
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Institution: | a Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, PR China b College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China c Department of Applied Chemistry, School of Materials Science and Engineering, Beihang University, Beijing 100083, PR China |
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Abstract: | Highly oriented ZnO nanorod arrays with controlled diameter and length, narrow size distribution and high orientation consistency have been successfully prepared on ITO substrates at different growth temperatures by using a simple hydrothermal method. XRD results indicate that the nanorods are high-quality single crystals growing along 001] direction with a high consistent orientation perpendicular to the substrate. SEM images show that the nanorods have average diameters of about 30-70 nm by changing growth temperature. The thin films consisting of ZnO nanorods with controlled orientation onto ITO substrates allow a more efficient transport and collection of photogenerated electrons through a designed path. For a sandwich-type cell, the relatively high overall solar energy conversion efficiency reaches about 2.4% when the growth temperature is at 95 °C. |
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Keywords: | ZnO nanorod arrays Photoelectrochemical properties Hydrothermal Growth temperature |
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