Document Detail


Hierarchical weeping willow nano-tree growth and effect of branching on dye-sensitized solar cell efficiency.
MedLine Citation:
PMID:  22538967     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Indria Herman; Junyeob Yeo; Sukjoon Hong; Daeho Lee; Koo Hyun Nam; Jun-Ho Choi; Won-Hwa Hong; Dongjin Lee; Costas P Grigoropoulos; Seung Hwan Ko
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-27
Journal Detail:
Title:  Nanotechnology     Volume:  23     ISSN:  1361-6528     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101241272     Medline TA:  Nanotechnology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  194005     Citation Subset:  -    
Affiliation:
Applied Nano Technology and Science Lab, Department of Mechanical Engineering, KAIST, 373-1 Gusung-Dong, Yusong-Gu, Daejeon 305-701, Korea.
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