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- W2001499501 abstract "The transient absorption of nanocrystalline TiO2 films in the visible and IR wavelength regions was measured under the weak-excitation condition, where the second-order electron–hole recombination process can be ignored. The intrinsic dynamics of the electron–hole pairs in the femtosecond to picosecond time range was elucidated. Surface-trapped electrons and surface-trapped holes were generated within ∼200 fs (time resolution). Surface-trapped electrons, which gave an absorption peak at around 800 nm, and bulk electrons, which absorbed in the IR wavelength region, decayed with a 500-ps time constant due to relaxation into deep bulk trapping sites. It is already known that, after this relaxation, electrons and holes survive for microseconds. We interpreted these long lifetimes in terms of the prompt spatial charge separation of electrons in the bulk and holes at the surface." @default.
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- W2001499501 date "2007-01-01" @default.
- W2001499501 modified "2023-10-16" @default.
- W2001499501 title "Dynamics of efficient electron–hole separation in TiO<sub>2</sub>nanoparticles revealed by femtosecond transient absorption spectroscopy under the weak-excitation condition" @default.
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- W2001499501 doi "https://doi.org/10.1039/b617552j" @default.
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