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Dynamics of Electron Injection in Nanocrystalline Titanium Dioxide Films Sensitized with [Ru(4,4‘-dicarboxy-2,2‘-bipyridine)2(NCS)2] by Infrared Transient Absorption

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Center for Basic Sciences, National Renewable Energy Laboratory, Golden, Colorado, 80401, and Department of Chemistry, Emory University, Atlanta, Georgia, 30322
Cite this: J. Phys. Chem. B 1998, 102, 34, 6455–6458
Publication Date (Web):August 1, 1998
https://doi.org/10.1021/jp982310y
Copyright © 1998 American Chemical Society

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    Abstract

    We have used femtosecond pump−probe spectroscopy to time resolve the injection of electrons into nanocrystalline TiO2 film electrodes under ambient conditions following photoexcitation of the adsorbed dye, [Ru(4,4‘-dicarboxy-2,2‘-bipyridine)2(NCS)2] (N3). Pumping at one of the metal-to-ligand charge-transfer absorption peaks and probing the absorption by injected electrons in the TiO2 at 1.52 μm and in the range of 4.1−7.0 μm, we have directly observed the arrival of electrons injected into the TiO2 film. Our measurements indicate an instrument-limited ∼50 fs upper limit on the electron injection time. We have compared the infrared transient absorption for noninjecting systems consisting of N3 in ethanol and N3 adsorbed to films of nanocrystalline Al2O3 and ZrO2 and found no indication of electron injection at probe wavelengths in the mid-IR (4.1−7.0 μm).

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    *

     To whom correspondence should be addressed:  R.J.E., [email protected]; T.L., [email protected]; A.J.N., [email protected].

     National Renewable Energy Laboratory.

     Emory University.

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