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

doi:10.1021/jp803402x

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 journal › Article

20 Citations (Scopus)

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 language	English
Pages (from-to)	12065-12068
Number of pages	4
Journal	Journal of Physical Chemistry C
Volume	112
Issue number	32
DOIs	https://doi.org/10.1021/jp803402x
Publication status	Published - Aug 14 2008

ASJC Scopus subject areas

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

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Smeigh, A. L., Katz, J. E., Brunschwig, B. S., Lewis, N. S., & McCusker, J. K. (2008). Effect of the presence of iodide on the electron injection dynamics of dye-sensitized TiO₂-based solar cells. Journal of Physical Chemistry C, 112(32), 12065-12068. https://doi.org/10.1021/jp803402x

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

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.",

author = "Smeigh, {Amanda L.} and Katz, {Jordan E.} and Brunschwig, {Bruce S.} and Lewis, {Nathan S.} and McCusker, {James K.}",

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AU - Lewis, Nathan S.

AU - McCusker, James K.

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N2 - 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.

AB - 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.

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