Preparation of Vertically Aligned ZnO-TiO2 Core-Shell Composites for Dye-Sensitized Solar CellsReport as inadecuate

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International Journal of PhotoenergyVolume 2013 2013, Article ID 417964, 9 pages

Research ArticleDepartment of Materials Engineering, Kun-Shan University, Yung Kang, Tainan 710, Taiwan

Received 13 September 2013; Accepted 6 October 2013

Academic Editor: Teen-Hang Meen

Copyright © 2013 Lung-Chuan Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Vertically aligned ZnO-TiO2 VA-ZnO-TiO2 core-shell composites deposited on ZnO-seeded indium tin oxide ITO glasses have been synthesized by a chemical bath deposition approach for growing one-dimensional ZnO structure followed by a spin procedure for coating TiO2 on the surface of ZnO structure. The influences of the cycles of spin coating of TiO2 CSCT on the properties of VA-ZnO-TiO2 and performances of the assembled DSSCs were studied. The power conversion efficiency of the VA-ZnO-TiO2-based DSSC measured under illumination of 100 mW-cm

and AM 1.5 can reach 0.81%, representing 93% improvement when compared with that of the pristine VA-ZnO electrode 0.42%. The intensity-modulated photocurrent spectroscopy IMPS and electrochemical impedance spectroscopy EIS were applied to study the kinetics and interfacial transfer of the photogenerated electrons. Both the photocurrent and power conversion efficiency correlate well with the steady state electron density. Enlargement in surface area and dye adsorption, suppression of dissolution of Zn

, diminishment in electron recombination, and fast transfer of injected electrons from excited dyes to TiO2 conduction bands arising from coating TiO2 on VA-ZnO are regarded as the predominant causes for this improvement.

Author: Lung-Chuan Chen, Shuei-Feng Tsai, Jean-Hong Chen, and Gaun-Wen Wang



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