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Hierarchical weeping willow nano-tree growth and effect of branching on dye-sensitized solar cell efficiency

Title
Hierarchical weeping willow nano-tree growth and effect of branching on dye-sensitized solar cell efficiency
Authors
Herman I.Yeo J.Hong S.Lee D.Nam K.H.Choi J.-H.Hong W.-H.Grigoropoulos C.P.Ko S.H.
Ewha Authors
남구현
Issue Date
2012
Journal Title
Nanotechnology
ISSN
0957-4484JCR Link
Citation
vol. 23, no. 19
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In this paper we have demonstrated the simple, low cost, low temperature, hydrothermal growth of weeping willow ZnO nano-trees with very long branches to realize high efficiency dye-sensitized solar cells (DSSCs). We also discuss the effects of branching on solar cell efficiency. By introducing branched growth on the backbone ZnO nanowires (NWs), the short circuit current density and the overall light conversion efficiency of the branched ZnO NW DSSCs increased to almost four times that for vertically grown ZnO NWs. The efficiency increase is attributed to the increase in surface area for higher dye loading and light harvesting and also to reduced charge recombination through direct conduction along the crystalline ZnO branches. As the length of the branches increased, the branches became flaccid and the increase in solar cell efficiency slowed down because the effective surface area increase was hindered by branch bundling during the drying process and subsequent decrease in the dye loading. © 2012 IOP Publishing Ltd.
DOI
10.1088/0957-4484/23/19/194005
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연구기관 > 초기우주과학기술연구소 > Journal papers
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