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Cited by 286

The DOI matches its Crossref record; 24 of the 24 references it cites were found in a registry or an index.

Electron Transfer Dynamics in Nanocrystalline Titanium Dioxide Solar Cells Sensitized with Ruthenium or Osmium Polypyridyl Complexes

Kuciauskas, Darius, Freund, Michael S., Gray, Harry B., Winkler, Jay R., Lewis, Nathan S.·2001·The Journal of Physical Chemistry B
DOI 10.1021/jp002545l
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Abstract

The electron transfer dynamics in solar cells that utilize sensitized nanocrystalline titanium dioxide photoelectrodes and the iodide/triiodide redox couple have been studied on a nanosecond time scale. The ruthenium and osmium bipyridyl complexes Ru(H 2 L‘) 2 (CN) 2, Os(H 2 L‘) 2 (CN) 2, Ru(H 2 L‘) 2 (NCS) 2, and Os(H 2 L‘) 2 (NCS) 2, where H 2 L‘ is 4,4‘-dicarboxylic acid 2,2‘-bipyridine, inject electrons into the semiconductor with a rate constant >10 8 s -1 . The effects of excitation intensity, temperature, and applied potential on the recombination reaction were analyzed using a second-order kinetics model. The rates of charge recombination decrease with increasing driving force to the oxidized sensitizer, indicating that charge recombination occurs in the Marcus inverted region. The electronic coupling factors between the oxidized sensitizer and the injected electrons in TiO 2 and the reorganization energies for the recombination reaction vary significantly for the different metal complexes. The charge recombination rates are well described by semiclassical electron transfer theory with reorganization energies of 0.55−1.18 eV. Solar cells sensitized with Ru(H 2 L‘) 2 (CN) 2, Os(H 2 L‘) 2 (CN) 2, and Ru(H 2 L‘) 2 (NCS) 2 have favorable photoelectrochemical characteristics, and iodide is oxidized efficiently. In contrast, iodide oxidation limits the efficiency of cells based on sensitization of TiO 2 with Os(H 2 L‘) 2 (NCS) 2 . The observation that charge recombination occurs in the Marcus inverted region has important implications for the design of molecular sensitizers in nanocrystalline solar cells operated under our experimental conditions.

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Metadata

Authors
Kuciauskas, D., Freund, M. S., Gray, H. B., Winkler, J. R., & Lewis, N. S.
Venue
The Journal of Physical Chemistry B
Publisher
American Chemical Society (ACS)
Published
2000-12-19
Volume
105
Issue
2
Pages
392-403
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
DOI
10.1021/jp002545l
OpenAlex
W2094815515
Cited by
286
References
24
FWCI
20.71
Type
journal article
Language
en
Open access
closed

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