Adjusting Porosity and Pore Radius of Electrodeposited ZnO Photoanodes
The optimization of the porosity and pore radius of ZnO for the application in dye-sensitized solar cells is essential to enhance the cell performance. Porous ZnO films were fabricated by electrodeposition in the presence of eosin Y or in combination with eosin B which was used as a structure direct...
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Published in | Journal of the Electrochemical Society Vol. 166; no. 9; pp. B3040 - B3046 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
The Electrochemical Society
2019
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Online Access | Get full text |
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Summary: | The optimization of the porosity and pore radius of ZnO for the application in dye-sensitized solar cells is essential to enhance the cell performance. Porous ZnO films were fabricated by electrodeposition in the presence of eosin Y or in combination with eosin B which was used as a structure directing agent (SDA) for the first time. The influence of the deposition time and the SDA concentration on film porosity and pore radius was characterized by a combined electrochemical and atomic absorption spectroscopy analysis, and confirmed by gas sorption, optical spectroscopy and scanning electron microscopy. The combination of eosin Y with eosin B as SDA results in porous ZnO films with larger pore radius compared to the films prepared with eosin Y only. The larger pores showed a significantly decreased diffusion impedance leading to an increased photocurrent less hindered by mass transport. Successful application of these new ZnO films in dye-sensitized solar cells confirmed improved pathways for large complex ions as redox shuttles through the ZnO pore structure. |
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Bibliography: | 0101909JES |
ISSN: | 0013-4651 1945-7111 |
DOI: | 10.1149/2.0101909jes |