Determination of density and energetic distribution of electron traps in dye-sensitized nanocrystalline solar cells

Article Abstract:

A direct method of determining the density and energetic distribution of the trapping states responsible for slowing electron transport is developed which involves extraction of tract electrons by switching the cell from an open circuit to a short circuit after a period of illumination. Results show that the density of trapped electrons can be determined as a function of the electron quasi Fermi level without the need to make any additional assumptions.

Solar cells, Solar batteries

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Electron transport and back reaction in electrochemically self-assemble nanoporous ZnO/dye hybrid films

Article Abstract:

Electron transport and back reaction in self assembled nanoporous ZnO/dye hybrid films are investigated by intensity modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS). The shorter transit times in the electrodeposited layers are shown to be due to the fact that the films are very thin, but in addition the electron diffusion coefficients are higher than in sintered colloidal ZnO films.

Spectrum analysis, Spectroscopy, Photochemical research, Photovoltaic power generation

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Interligand electron transfer determines triplet excited state electron injection in RuN3-sensitized TiO2 films

Article Abstract:

The ultrafast electron transfer (ET) from the photoexcited transition metal complex Ru (dcbpy) 2(NCS) 2 (RuN3; dcbpy = 2,2 inch-bipyridine-4, 4 inch-dicarboxylate) to TiO2 nanoparticles is analyzed. The study reveals that the interligand electron-transfer time is on the picosecond time scale, depends on the relative energies of the two ligands, and controls the electron injection from the excited triplet state of the sensitizer.

Ligands, Ligands (Chemistry)

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