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Effect of the Presence of Iodide on the Electron Injection Dynamics of Dye-Sensitized TiO_2-Based Solar Cells

Smeigh, Amanda L. and Katz, Jordan E. and Brunschwig, Bruce S. and Lewis, Nathan S. and McCusker, James K. (2008) Effect of the Presence of Iodide on the Electron Injection Dynamics of Dye-Sensitized TiO_2-Based Solar Cells. Journal of Physical Chemistry C, 112 (32). pp. 12065-12068. ISSN 1932-7447. doi:10.1021/jp803402x.

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The electron injection dynamics of dye-sensitized TiO_2-based solar cells have been investigated to determine the effects of replacing the I_3^−/I^− redox system by non-redox-active supporting electrolytes. TiO-2 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(ClO_4) or M(I_3−/I−) solutions (M = Li^+ or (n-C_4H_9)_4N^+); cells that contained I_3−/I− were fully functional solar cells whose steady-state photocurrents were directly measured. In (n-C_4H_9)_4N^+-containing solutions, significant differences were observed between the measured kinetics when ClO_4^− 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 LiClO_4 or [(n-C_4H_9)4N]ClO_4 was absent in fully functional solar cells that contained [(n-C_4H_9)_4N]I/I_2. 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Katz, Jordan E.0000-0002-6242-2124
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2008 American Chemical Society. Received 18 April 2008. Published online 23 July 2008. Published in print 1 August 2008. Research was in part carried out at the Molecular Materials Research Center of the Beckman Institute of the California Institute of Technology. This work was supported by the Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Science, U.S. Department of Energy Grants DE-FG02-03ER15483 (N.S.L.) and DE-FG02-01ER15282 (J.K.M.).
Funding AgencyGrant Number
Caltech Beckman InstituteUNSPECIFIED
Department of Energy (DOE)DE-FG02-03ER15483
Department of Energy (DOE)DE-FG02-01ER15282
Issue or Number:32
Record Number:CaltechAUTHORS:20170719-090248351
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Official Citation: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, and James K. McCusker The Journal of Physical Chemistry C 2008 112 (32), 12065-12068 DOI: 10.1021/jp803402x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79195
Deposited By: Ruth Sustaita
Deposited On:19 Jul 2017 16:47
Last Modified:15 Nov 2021 17:46

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