Carrier recombination dynamics in anatase TiO2 nanoparticles

We present an experimental study of the radiative recombination dynamics in size-controlled TiO2 nanoparticles in the range 20-130aanm. Time-integrated photoluminescence spectra clearly show a dominance of self-trapped exciton (STE) emission, with main features not dependent on the nanoparticle size...

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Published inSolid state sciences Vol. 12; no. 11; pp. 1877 - 1880
Main Authors Cavigli, Lucia, Bogani, Franco, Vinattieri, Anna, Cortese, Lorenzo, Colocci, Marcello, Faso, Valentina, Baldi, Giovanni
Format Journal Article
LanguageEnglish
Published 01.11.2010
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Summary:We present an experimental study of the radiative recombination dynamics in size-controlled TiO2 nanoparticles in the range 20-130aanm. Time-integrated photoluminescence spectra clearly show a dominance of self-trapped exciton (STE) emission, with main features not dependent on the nanoparticle size and on its environment. From picosecond time-resolved experiments as a function of the excitation density and the nanoparticle size we address the STE recombination dynamics as the result of two main processes related to the direct STE formation and to the indirect STE formation mediated by non-radiative surface states. Display Omitted
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ISSN:1293-2558
DOI:10.1016/j.solidstatesciences.2010.01.036