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Sökning: WFRF:(Taratula O.)

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1.
  • Abrahamsson, Maria, et al. (författare)
  • Meta-substituted Ru(II) rigid rods for sensitization of TiO(2)
  • 2009
  • Ingår i: Journal of Photochemistry and Photobiology, A: Chemistry. - : Elsevier BV. - 1873-2666 .- 1010-6030. ; 206:2-3, s. 155-163
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract in Undetermined Ruthenium polypyridyl rigid-rod compounds with phenylene-ethynelene (OPE) spacers and an isophthalic acid (Ipa) binding group were synthesized and characterized for sensitization of nanocrystalline TiO(2) (anatase) thin films. Density functional theory predicted that the most stable structure oriented the isophthalic group about 45 degrees from normal to the TiO(2) surface. Comparative experimental studies of meta- and para-isomers revealed small changes in the ground state absorption spectra and very similar excited state and redox properties. The excited state injection yields (inj = 0.15 +/- 0.03)into nanocrystalline TiO(2) and the subsequent charge recombination rates were found to be insensitive to the isomer utilized. Meta-substitution enabled the synthesis of sensitizers with two Ru(II) sensitizers that displayed enhanced sunlight absorption relative to the monomeric compound.
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2.
  • Nemec, Hynek, et al. (författare)
  • Influence of the Electron-Cation Interaction on Electron Mobility in Dye-Sensitized ZnO and TiO2 Nanocrystals: A Study Using Ultrafast Terahertz Spectroscopy
  • 2010
  • Ingår i: Physical Review Letters. - 1079-7114. ; 104:19
  • Tidskriftsartikel (refereegranskat)abstract
    • Charge transport and recombination in nanostructured semiconductors are poorly understood key processes in dye-sensitized solar cells. We have employed time-resolved spectroscopies in the terahertz and visible spectral regions supplemented with Monte Carlo simulations to obtain unique information on these processes. Our results show that charge transport in the active solar cell material can be very different from that in nonsensitized semiconductors, due to strong electrostatic interaction between injected electrons and dye cations at the surface of the semiconductor nanoparticle. For ZnO, this leads to formation of an electron-cation complex which causes fast charge recombination and dramatically decreases the electron mobility even after the dissociation of the complex. Sensitized TiO2 does not suffer from this problem due to its high permittivity efficiently screening the charges.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Taratula, O. (2)
Galoppini, E. (2)
Sundström, Villy (1)
Abrahamsson, Maria (1)
Persson, Petter (1)
Meyer, G. J. (1)
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Yartsev, Arkady (1)
Němec, Hynek (1)
Kuzel, P. (1)
Rochford, J. (1)
Polivka, T. (1)
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Lunds universitet (2)
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Engelska (2)
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Naturvetenskap (2)

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