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• W2022278314 endingPage "12592" @default.
• W2022278314 startingPage "12583" @default.
• W2022278314 abstract "The processes involved in ultrafast electron injection from a photoexcited novel coumarin dye (NKX-2311), an efficient photosensitizer for TiO2-based dye-sensitized solar cells, into the conduction band of a nanocrystalline ZnO film were investigated by observing the femtosecond transient absorption in the visible-to-infrared range (600−5000 nm). After photoexcitation of adsorbed NKX-2311 dye, the stimulated emission and absorption of the singlet excited dye decayed with a 500-fs time constant. These were followed by rises in absorptions of the oxidized dye and conduction-band electrons, indicating a direct electron-injection process. In addition, indirect electron-injection processes involving intermediates were identified. The intermediates showed stimulated emission at longer wavelengths than that of the excited dye; very broad absorptions in the near-IR region (900−1300 nm) were observed immediately after excitation, and they decayed with 1- and 10-ps time constants, leading to further rises in the absorption of electrons in the conduction band. On the basis of their dynamics and spectral features, the species decaying with 1- and 10-ps time constants were assigned to neutral and ionic exciplexes, respectively. The multiplicity of electron-injection processes is due to the presence of various adsorption sites for the dye on the ZnO surface." @default.
• W2022278314 created "2016-06-24" @default.
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• W2022278314 date "2004-07-24" @default.
• W2022278314 modified "2023-09-27" @default.
• W2022278314 title "Ultrafast Direct and Indirect Electron-Injection Processes in a Photoexcited Dye-Sensitized Nanocrystalline Zinc Oxide Film: The Importance of Exciplex Intermediates at the Surface" @default.
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• W2022278314 doi "https://doi.org/10.1021/jp0487713" @default.
• W2022278314 hasPublicationYear "2004" @default.
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