Reduced electron recombination of dye-sensitized solar cells based on TiO 2 spheres consisting of ultrathin nanosheets with [001] facet exposed
Data(s) |
2012
|
---|---|
Resumo |
An anatase TiO 2 material with hierarchically structured spheres consisting of ultrathin nanosheets with 100% of the [001] facet exposed was employed to fabricate dye-sensitized solar cells (DSC s). Investigation of the electron transport and back reaction of the DSCs by electrochemical impedance spectroscopy showed that the spheres had a threefold lower electron recombination rate compared to the conventional TiO 2 nanoparticles. In contrast, the effective electron diffusion coefficient, D n, was not sensitive to the variation of the TiO 2 morphology. The TiO 2 spheres showed the same Dn as that of the nanoparticles. The influence of TiCl 4 post-treatment on the conduction band of the TiO 2 spheres and on the kinetics of electron transport and back reactions was also investigated. It was found that the TiCl 4 post-treatment caused a downward shift of the TiO 2 conduction band edge by 30 meV. Meanwhile, a fourfold increase of the effective electron lifetime of the DSC was also observed after TiCl4 treatment. The synergistic effect of the variation of the TiO 2 conduction band and the electron recombination determined the open-circuit voltage of the DSC. © 2012 Wang et al. |
Formato |
application/pdf |
Identificador | |
Publicador |
Beilstein - Institut zur Foerderung der Chemischen Wissenschaften |
Relação |
http://eprints.qut.edu.au/50816/1/50816.pdf DOI:10.3762/bjnano.3.44 Wang, Hongxia, Liu, Meinan, Yan, Cheng, & Bell, John (2012) Reduced electron recombination of dye-sensitized solar cells based on TiO 2 spheres consisting of ultrathin nanosheets with [001] facet exposed. Beilstein Journal of Nanotechnology, 3, pp. 378-387. |
Direitos |
Copyright 2012 The Author(s). |
Fonte |
School of Chemistry, Physics & Mechanical Engineering; Science & Engineering Faculty |
Palavras-Chave | #090000 ENGINEERING #Dye-sensitized solar cells #Electrochemical impedance spectroscopy #Electron recombination #Tio #2 [001] facet #Ultrathin nanosheets |
Tipo |
Journal Article |