Electron injection, recombination, and halide oxidation dynamics at dye-sensitized metal oxide interfaces
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.
- Research Organization:
- National Inst. of Standards and Technology, Gaithersburg, MD (US)
- OSTI ID:
- 20075899
- Journal Information:
- Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Vol. 104, Issue 18; Other Information: PBD: 11 May 2000; ISSN 1089-5639
- Country of Publication:
- United States
- Language:
- English
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