Effect of the presence of iodide on the electron injection dynamics of dye-sensitized TiO2-based solar cells

Amanda L. Smeigh, Jordan E. Katz, Bruce S. Brunschwig, Nathan S Lewis, James K. McCusker

Research output: Contribution to journalArticle

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Abstract

The electron injection dynamics of dye-sensitized TiO2-based solar cells have been investigated to determine the effects of replacing the I3-/I- redox system by non-redox-active supporting electrolytes. TiO2 films were sensitized with Ru(dcbpy)2(NCS)2, where dcbpy = 4,4′-dicarboxylic acid-2,2′-bipyridine (the "N3" dye), and placed in contact with either M(C104) or M(I3-/I-) solutions (M = Li+ or (n-C4N9) 4N+);cells that contained I3-/I - were fully functional solar cells whose steady-state photocurrents were directly measured. In (n-C4H9)4N +-containing solutions, significant differences were observed between the measured kinetics when C104- was replaced by the redox-active I3-/I- system. In particular, a ps time scale loss of the metal-to-ligand charge-transfer excited-state of the N3 dye, associated with electron injection, that was observed in cells containing either LiClO4 or [(n-C4H9)4N] ClO4 was absent in fully functional solar cells that contained [(n-C4H9)4N]I/I2. These results underscore the importance of performing kinetics measurements on this class of solar cells under operational conditions if one is to obtain reliable correlations between the dynamics data and the steady-state performance metrics of the solar cell devices.

Original languageEnglish
Pages (from-to)12065-12068
Number of pages4
JournalJournal of Physical Chemistry C
Volume112
Issue number32
DOIs
Publication statusPublished - Aug 14 2008

Fingerprint

Electron injection
Iodides
iodides
Solar cells
Coloring Agents
Dyes
solar cells
dyes
injection
electrons
Dicarboxylic Acids
Kinetics
dicarboxylic acids
kinetics
cells
Photocurrents
Excited states
Electrolytes
photocurrents
Charge transfer

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Effect of the presence of iodide on the electron injection dynamics of dye-sensitized TiO2-based solar cells. / Smeigh, Amanda L.; Katz, Jordan E.; Brunschwig, Bruce S.; Lewis, Nathan S; McCusker, James K.

In: Journal of Physical Chemistry C, Vol. 112, No. 32, 14.08.2008, p. 12065-12068.

Research output: Contribution to journalArticle

Smeigh, Amanda L. ; Katz, Jordan E. ; Brunschwig, Bruce S. ; Lewis, Nathan S ; McCusker, James K. / Effect of the presence of iodide on the electron injection dynamics of dye-sensitized TiO2-based solar cells. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 32. pp. 12065-12068.
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