Journal
NANOSCALE
Volume 6, Issue 9, Pages 4691-4697Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr00137k
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Funding
- National Major Research Program of China [2013CB932602]
- Major Project of International Cooperation and Exchanges [2012DFA50990]
- Program of Introducing Talents of Discipline to Universities
- NSFC [51232001, 51172022, 51372023]
- Fundamental Research Funds for the Central Universities
- Program for Changjiang Scholars and Innovative Research Team in University
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The fabrication of photoanodes with a high light-harvesting ability, direct electron pathway and low exciton recombination is a key challenge in dye-sensitized solar cells (DSSCs) today. In this paper, large-scale patterned ZnO-ZnS core-shell nanowire arrays (NWAs) are designed and fabricated as such photoanodes for the fist time. By using the NWA photoanodes with a hexagonal symmetry and FTO-Pt cathodes with an Al reflecting layer, the resulting DSSCs demonstrate a maxiumum efficiency of 2.09%, which is an improvement of 140% compared to the reference cells with line symmetry and no reflecting layer. This improvement is attributed to the enhanced light-harvesting ability of the patterned NWAs, as well as to the remarkable double absorption caused by the Al reflecting layer. Additionally, the ZnO core provides a direct electron pathway and the ZnS shell simultaneously reduces exciton recombination. This study shows an effective method to improve the performance of DSSCs which could be extended to other nanodevices and nanosystems.
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