Boosting ZnO nanowire dye-sensitized solar cell efficiency by coating a porous ZnO layer on the nanowires

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• 作者：Yufu Zhu ; Fei Deng ; Chaoying Ni…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：25
• 期：10
• 页码：4547-4552
• 全文大小：2,185 KB
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• 作者单位：Yufu Zhu (1) (2)
  Fei Deng (2)
  Chaoying Ni (2)
  Wenzhong Shen (3)
  
  1. Jiangsu Provincial Key Laboratory for Interventional Medical Devices, Huaiyin Institute of Technology, Huaian, 223003, China
  2. Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA
  3. Institute of Solar Energy, and Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China
  
• ISSN：1573-482X

文摘

Novel ZnO core/shell nanostructures were constructed by depositing a porous ZnO layer directly on the surfaces of pre-fabricated ZnO nanowires through a facile chemical method. The morphology and structure of the obtained products have been investigated by field-emission scanning electron microscopy, high-resolution transmission electron microscopy and X-ray diffraction analysis. In these unique nanostructures, the porous overlayer exhibits a large surface area for sufficient dye loading to enhance light harvesting and the ZnO nanowire cores provide direct conduction pathways for the photogenerated electron transport to diminish the chance of electron recombination. The obtained ZnO nanostructures were used as photoanode material in dye-sensitized solar cell which showed an increase in performance of 141?% compared with an equivalent solar cell employing ZnO nanowire arrays as photoanode. This result was achieved mainly due to an increase in photogenerated current density directly resulting from improved light harvesting of the porous layer.