期刊
NANO LETTERS
卷 11, 期 2, 页码 666-671出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl1037962
关键词
Zinc oxide nanowire; dye-sensitized solar cell; nanoforest; hierarchical growth; branched structure
类别
资金
- Korea Ministry of Knowledge Economy [10032145]
- National Research Foundation of Korea [2010-0003973]
- Creative Research Initiatives (Center for Opto-Fluid-Flexible Body Interaction) of MEST/NRF [N10100038]
- NSF STTR [0930594]
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [0930594] Funding Source: National Science Foundation
- Korea Evaluation Institute of Industrial Technology (KEIT) [10032145] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-0003973, 2009-0081572] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this paper, in order to increase the power conversion efficiency we demonstrated the selective growth of nanoforest composed of high density, long branched treelike multigeneration hierarchical ZnO nanowire photoanodes. The overall light-conversion efficiency of the branched ZnO nanowire DSSCs was almost 5 times higher than the efficiency of DSSCs constructed by upstanding ZnO nanowires. The efficiency increase is due to greatly enhanced surface area for higher dye loading and light harvesting, and also due to reduced charge recombination by providing direct conduction pathways along the crystalline ZnO nanotree multi generation branches. We performed a parametric study to determine optimum hierarchical ZnO nanowire photoanodes through the combination of both length wise growth and branched growth processes. The novel selective hierarchical growth approach represents a low cost, all solution processed hydrothermal method that yields complex hierarchical ZnO nanowire photoanodes by utilizing a simple engineering of seed particles and capping polymer.
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