Liu, B;
Zhao, X;
Yu, J;
Parkin, IP;
Fujishima, A;
Nakata, K;
(2019)
Intrinsic intermediate gap states of TiO₂ materials and their roles in charge carrier kinetics.
Journal of Photochemistry and Photobiology C: Photochemistry Reviews
, 39
pp. 1-57.
10.1016/j.jphotochemrev.2019.02.001.
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Abstract
Titanium dioxide (TiO 2 ) is regarded as an important prototype photocatalytic material for several decades. The charge carrier kinetics determines the photocatalytic properties of TiO 2 materials; this is found to be greatly dependent on electronic structures. It has been revealed that the intrinsic intermediate gap states (intrinsic GSs) play a significant role in charge carrier kinetics that drive the photocatalytic processes of TiO 2 materials, which are not well summarized until now. Motivated by this thought, the purpose of this review focuses on physiochemical science of the intrinsic GSs of TiO 2 materials and their important role in charge carrier kinetics. We first give a summary on the chemical resources of the intrinsic GSs in TiO 2 and their physiochemical nature. Their general energy distribution, charge carrier population, and the associated thermodynamic properties are also elaborated from an overall viewpoint. We further carefully summarize and compare the experimental studies on the energy and the density distribution of the intrinsic GSs and discuss the associated chemical resources and charge carrier localizations. Trapping is the dominant function of intrinsic GSs in the charge carrier kinetics of TiO 2 materials. The significant effect of trapping on the transport, recombination, and interfacial transfer of charge carriers are also comprehensive summarized. Furthermore, the effects of charge carrier kinetics on photocatalytic performances are also discussed to some extents. Because of the importance of intrinsic GSs in modulating charge carrier kinetics, it is expected to increase the photocatalytic activity by engineering the intrinsic GSs, not only for TiO 2 materials, but also for the other semiconductor photocatalysts.
| Type: | Article |
|---|---|
| Title: | Intrinsic intermediate gap states of TiO₂ materials and their roles in charge carrier kinetics |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jphotochemrev.2019.02.001 |
| Publisher version: | https://doi.org/10.1016/j.jphotochemrev.2019.02.00... |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | TiO2 materials, Intermediate gap states, Intrinsic defects, Charge carrier localization, Charge carrier kinetics, Photocatalysis |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10085442 |
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