Sub-Picosecond Injection of Electrons from Excited [Ru (2,2'-bipy-4,4'-dicarboxy)2(SCN)2] into TiO2 Using Transient Mid-Infrared Spectroscopy

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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 adsorption peaks and probing the absorption of electrons injected into the TiO2 conduction band at 1.52 {micro}m and in the range of 4.1 to 7.0 {micro}m, we have directly observed the arrival of the injected electrons. Our measurements indicate an instrument-limited {approx}50-fs upper limit on the electron injection time under ambient conditions in air. We have compared the infrared transient absorption for noninjecting ... continued below

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Ellingson, R. J.; Asbury, J. B.; Ferrere, S.; Ghosh, H. N.; Sprague, J. R.; Lian, T. et al. May 4, 1999.

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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 adsorption peaks and probing the absorption of electrons injected into the TiO2 conduction band at 1.52 {micro}m and in the range of 4.1 to 7.0 {micro}m, we have directly observed the arrival of the injected electrons. Our measurements indicate an instrument-limited {approx}50-fs upper limit on the electron injection time under ambient conditions in air. We have compared the infrared transient absorption for noninjecting (blank) 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 to 7.0 {micro}m). At 1.52 {micro}m interferences exist in the observed transient adsorption signal for the blanks.

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OSTI as DE00006899

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  • Presented at the 12th International Conference on Photochemical Conversion and Storage of Solar Energy, Berlin (DE), 08/09/1998--08/14/1998

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  • Other: DE00006899
  • Report No.: NREL/CP-590-25519
  • Grant Number: AC36-99-GO10337
  • Office of Scientific & Technical Information Report Number: 6899
  • Archival Resource Key: ark:/67531/metadc703713

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  • May 4, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 31, 2016, 7:16 p.m.

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Ellingson, R. J.; Asbury, J. B.; Ferrere, S.; Ghosh, H. N.; Sprague, J. R.; Lian, T. et al. Sub-Picosecond Injection of Electrons from Excited [Ru (2,2'-bipy-4,4'-dicarboxy)2(SCN)2] into TiO2 Using Transient Mid-Infrared Spectroscopy, article, May 4, 1999; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc703713/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.