Journal
APPLIED SURFACE SCIENCE
Volume 258, Issue 1, Pages 321-326Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2011.08.058
Keywords
Dye-sensitized solar cell; Fill factor; Electron injection efficiency
Categories
Funding
- NSFC [60976055]
- Fundamental Research Funds for the Central Universities [CDJXS11102208]
- Postgraduates' Innovative Training Project of the 3rd-211 Project [S-09109]
- Chongqing University
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The fill factor of dye-sensitized solar cells based on the ZnO nanowire array is very low, which is usually ascribed to a rapid charge recombination. In this article, the influence on the fill factor of ZnO nanowire array cell is investigated and discussed by comparing dark current and decay rate of open circuit potential of the ZnO nanowire array cell with those of the ZnO nanoparticle cell, TiO2 nanoparticle cell and TiO2-coated ZnO nanowire array cell. The results demonstrate that the low fill factor of the ZnO nanowire array cell is largely caused by a rapid decrease of electron injection efficiency rather than a rapid charge recombination, which is decided by the absorption nature of Ru-complexed dye molecules on ZnO surface and repellency of radial electric field. The fill factor of the ZnO nanowire array cell can be improved by coating ZnO nanowires with a wide band gap semiconductor material or metal oxide insulator. (C) 2011 Elsevier B.V. All rights reserved.
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