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Comparison of Trap-state Distribution and Carrier Transport in Nanotubular and Nanoparticulate TiO2 Electrodes for Dye-Sensitized Solar Cells
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
2010 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 11, no 10, 2140-2145 p.Article in journal (Refereed) Published
Abstract [en]

Dye-sensitized solar cells (DSCs) with nanotubular TiO2 electrodes of varying thicknesses are compared to DSCs based on conventional nanoparticulate electrodes. Despite the higher degree of order in one-dimensional nanotubular electrodes, electron transport times and diffusion coefficients, determined under short-circuit conditions, are comparable to those of nanoparticulate electrodes. The quasi-Fermi level, however, is much lower in the nanotubes, suggesting a lower concentration of conduction band electrons. This provides evidence for a much higher diffusion coefficient for conduction band electrons in nanotubes than in nanoparticulate films. The electron lifetime and the diffusion length are significantly longer in nanotubular TiO2 electrodes than in nanoparticulate films. Nanotubular electrodes have a trap distribution that differs significantly from nanoparticulate electrodes; they possess relatively deeper traps and have a characteristic energy of the exponential distribution that is more than two times that of nanoparticulate electrodes.

Place, publisher, year, edition, pages
2010. Vol. 11, no 10, 2140-2145 p.
Keyword [en]
charge transfer, solar cells, electron lifetimes, nanotubes, trap distribution
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-135747DOI: 10.1002/cphc.201000125ISI: 000280428400016OAI: oai:DiVA.org:uu-135747DiVA: diva2:375517
Available from: 2010-12-08 Created: 2010-12-08 Last updated: 2011-06-23Bibliographically approved

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Hagfeldt, AndersBoschloo, Gerrit

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