期刊
NANOTECHNOLOGY
卷 23, 期 19, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/23/19/194005
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资金
- National Research Foundation of Korea [2011-0028662, 2011-0005321]
- Center for Multiscale Energy System
- cooperative RD Program [B551179-10-01-00]
- technology development program [SL122685]
- Small & Medium Business Administration of Korea
- EEWS, of the office of KAIST EEWS Initiative [EEWS-2012]
- NSF STTR through AppliFlex LLC [0930594]
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [0930594] Funding Source: National Science Foundation
- National Research Council of Science & Technology (NST), Republic of Korea [B551179-10-01-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2010-0003973, 2011-0031569] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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