期刊
APPLIED PHYSICS LETTERS
卷 96, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3313936
关键词
amorphous state; calcination; electron mobility; grain size; high-speed optical techniques; mesoporous materials; nanostructured materials; photoconductivity; photoexcitation; semiconductor thin films; time resolved spectra; titanium compounds
资金
- Czech Science Foundation [202/09/P099, 104/08/0435-1, 203/08/H032]
- Academy of Sciences of the Czech Republic [A100100902, AVOZ10100520]
- German Science Foundation
Terahertz time-resolved spectroscopy is used to investigate the transport of photoexcited electrons in nanocrystalline mesoporous TiO2 films prepared by the recently proposed brick and mortar technology [Szeifert Chem. Mater. 21, 1260 (2009)] with a variable fraction of nanocrystalline titania bricks and amorphous titania mortar. Both long- and short-range conductivity is significantly enhanced upon calcination. After an ultrafast (subpicosecond) regime where the intrananograin conductivity dominates, the electron conductivity becomes limited by the interaction of electrons with the amorphous mortar. Comparison of the experimental results with Monte Carlo simulations of the electron motion allows us to determine the crystalline grain size after calcination and the yield of mobile photocarriers.
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