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 | |
| Publication status | Published - Aug 14 2008 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Energy(all)
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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 journal › Article
}
TY - JOUR
T1 - Effect of the presence of iodide on the electron injection dynamics of dye-sensitized TiO2-based solar cells
AU - Smeigh, Amanda L.
AU - Katz, Jordan E.
AU - Brunschwig, Bruce S.
AU - Lewis, Nathan S
AU - McCusker, James K.
PY - 2008/8/14
Y1 - 2008/8/14
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.
UR - http://www.scopus.com/inward/record.url?scp=50649117523&partnerID=8YFLogxK
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U2 - 10.1021/jp803402x
DO - 10.1021/jp803402x
M3 - Article
AN - SCOPUS:50649117523
VL - 112
SP - 12065
EP - 12068
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 32
ER -