Photoinduced ultrafast dynamics of coumarin 343 sensitized p-type-nanostructured NiO films

Ana Morandeira, Gerrit Boschloo, Anders Hagfeldt, Leif Hammarström

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159 Citations (Scopus)


Photoinduced electron transfer from the valence band of nanocrystalline NiO, a p-type semiconductor, to an excited bound dye, coumarin 343, and the subsequent recombination have been measured by femtosecond transient absorbance spectroscopy probing with white light. It was found that both processes are nonexponential. The photoinduced electron transfer from the semiconductor to the excited bound dye has an ultrafast component (∼200 fs), which is comparable to the time constants measured for photoinduced electron injection in C343 - TiO2 colloid solutions. The process is very efficient and constitutes the main path of deactivation of the excited dye. Back electron transfer is also remarkably fast, with the main part of the recombination process happening with a time constant of ∼20 ps. Dye-sensitized nanostructured p-type semiconductors are attractive materials due to their potential use as photocathodes in dye-sensitized solar cells and solid electrolytes in solid-state dye-sensitized solar cells. To our knowledge, this is the first time that the photoinduced electron-transfer kinetics of a sensitized p-type semiconductor has been studied.

Original languageEnglish
Pages (from-to)19403-19410
Number of pages8
JournalJournal of Physical Chemistry B
Issue number41
Publication statusPublished - Oct 20 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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