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Coumarin 343-NiO films as nanostructured photocathodes in dye-sensitized solar cells: Ultrafast electron transfer, effect of the I-3(-)/I- redox couple and mechanism of photocurrent generation

Morandeira, Ana and Boschloo, Gerrit and Hagfeldt, Anders and Hammarstrom, Leif (2008) Coumarin 343-NiO films as nanostructured photocathodes in dye-sensitized solar cells: Ultrafast electron transfer, effect of the I-3(-)/I- redox couple and mechanism of photocurrent generation. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (25). pp. 9530-9537.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp800760q

Abstract

Nanoporous, p-type NiO films were sensitized with coumarin 343 (C343), and the photoinduced electron transfer dynamics was studied in the presence of different concentrations of electrolyte (I-3(-)/I- in propylene carbonate). Electron transfer from the valence band of NiO to the excited C343 is very fast, occurring on time scales from hundreds of femtoseconds to a few picoseconds, but also the subsequent recombination is quite rapid, on the time scale of tens of picoseconds. Nevertheless, formation of an intermediate, attributed to I2-I NiO(+), was observed on the picosecond time scale. Simultaneously the reduced dye was converted back to the C343 ground state, indicating that recombination could be intercepted by 13 reduction. Consistent with that interpretation, we observed oxidized NiO and depletion Of 13 persisting on the millisecond time scale. Complete dye-sensitized solar cells (DSSCs) with these films as photocathode gave up to 10-11% incident photon to current conversion efficiency at the C343 visible absorption maximum, which is the highest value reported for a p-type DSSC. Our results elucidate the main mechanism for photocurrent generation in this p-type DSSC, which is important for the understanding and development of these rarely studied counterpart of conventional n-type ``Gratzel cells''.

Item Type:Article
Subjects:Technology > Nanotechnology and energy applications
Material Science > Nanostructured materials
Physical Science > Photonics
ID Code:1456
Deposited By:Farnush Anwar
Deposited On:12 Dec 2008 14:25
Last Modified:13 Jan 2009 16:56

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