Determination of electron and hole lifetimes of rutile and anatase TiO{sub 2} single crystals

Journal Article · Mon Sep 24 04:00:00 EDT 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4754831· OSTI ID:22080467

Yamada, Yasuhiro ^[1]; Kanemitsu, Yoshihiko ^[1]

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1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan)

The dynamical behavior of photoexcited states of TiO{sub 2} governs the activities of TiO{sub 2}-based solar cells and photocatalysts. We determined the lifetimes of photoexcited electrons and holes in rutile and anatase TiO{sub 2} single crystals by combining advantages of time-resolved photoluminescence, photoconductance, and transient absorption spectroscopy. Electrons and holes in rutile show exponential decays with the lifetime of a few tens of nanoseconds, while non-exponential decays are observed in anatase, indicating the presence of multiple carrier trapping processes. We revealed the generic features of the carrier recombination processes in rutile and anatase TiO{sub 2}.

• OSTI ID: 22080467
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 101; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
CARRIERS
CATALYSIS
CRYSTAL STRUCTURE
EXCITED STATES
LIFETIME
MONOCRYSTALS
PHOTOCHEMISTRY
PHOTOCONDUCTIVITY
PHOTOLUMINESCENCE
RECOMBINATION
RUTILE
SEMICONDUCTOR MATERIALS
SOLAR CELLS
SPECTRA
TIME RESOLUTION
TITANIUM OXIDES