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Title: Electron injection, recombination, and halide oxidation dynamics at dye-sensitized metal oxide interfaces

Abstract

Time-resolved infrared measurements indicate ultrafast, <350 fs, electron injection from (4,4{prime}dcb){sub 2}Ru(NCS){sub 2} (1) and (5,5{prime}dcb){sub 2}Ru(NCS){sub 2} (2) to nanostructured TiO{sub 2} electrodes (where 4,4{prime}dcb = 4,4{prime}-(COOH){sub 2}-2,2{prime}-bipyridine). Although rapid, the injection from 2 apparently occurs with a lower quantum yield than that from 1, explaining a lower overall photon-to-current efficiency for 2/TiO{sub 2} solar cells. Transient visible spectroscopy reveals similar rates of both halide oxidation and injected electron-oxidized dye recombination for the two sensitizers. Substituting SnO{sub 2} for TiO{sub 2} increases the electron injection yield from 2 in the case of transparent metal oxide films and improves the photon-to-current efficiency. Results indicate a wavelength-dependent electron injection yield.

Authors:
; ; ;
Publication Date:
Research Org.:
National Inst. of Standards and Technology, Gaithersburg, MD (US)
OSTI Identifier:
20075899
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory
Additional Journal Information:
Journal Volume: 104; Journal Issue: 18; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1089-5639
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HALIDES; OXIDATION; DYNAMICS; TITANIUM OXIDES; ELECTRODES; RUTHENIUM COMPLEXES; SOLAR CELLS; EXCITED STATES; INFRARED SPECTRA

Citation Formats

Heimer, T.A., Heilweil, E.J., Bignozzi, C.A., and Meyer, G.J. Electron injection, recombination, and halide oxidation dynamics at dye-sensitized metal oxide interfaces. United States: N. p., 2000. Web. doi:10.1021/jp993438y.
Heimer, T.A., Heilweil, E.J., Bignozzi, C.A., & Meyer, G.J. Electron injection, recombination, and halide oxidation dynamics at dye-sensitized metal oxide interfaces. United States. doi:10.1021/jp993438y.
Heimer, T.A., Heilweil, E.J., Bignozzi, C.A., and Meyer, G.J. Thu . "Electron injection, recombination, and halide oxidation dynamics at dye-sensitized metal oxide interfaces". United States. doi:10.1021/jp993438y.
@article{osti_20075899,
title = {Electron injection, recombination, and halide oxidation dynamics at dye-sensitized metal oxide interfaces},
author = {Heimer, T.A. and Heilweil, E.J. and Bignozzi, C.A. and Meyer, G.J.},
abstractNote = {Time-resolved infrared measurements indicate ultrafast, <350 fs, electron injection from (4,4{prime}dcb){sub 2}Ru(NCS){sub 2} (1) and (5,5{prime}dcb){sub 2}Ru(NCS){sub 2} (2) to nanostructured TiO{sub 2} electrodes (where 4,4{prime}dcb = 4,4{prime}-(COOH){sub 2}-2,2{prime}-bipyridine). Although rapid, the injection from 2 apparently occurs with a lower quantum yield than that from 1, explaining a lower overall photon-to-current efficiency for 2/TiO{sub 2} solar cells. Transient visible spectroscopy reveals similar rates of both halide oxidation and injected electron-oxidized dye recombination for the two sensitizers. Substituting SnO{sub 2} for TiO{sub 2} increases the electron injection yield from 2 in the case of transparent metal oxide films and improves the photon-to-current efficiency. Results indicate a wavelength-dependent electron injection yield.},
doi = {10.1021/jp993438y},
journal = {Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory},
issn = {1089-5639},
number = 18,
volume = 104,
place = {United States},
year = {2000},
month = {5}
}