Carrier-assisted recombination in anatase TiO2
Differential optical transmission experiments performed on TiO2 layers reveal a carrier population decay that follows a power-law over several orders of magnitude in both time and signal amplitude, across a temperature range from 10 K up to room temperature. The exponent of the power-law is fractional, increasing linearly at low temperatures before following an activation law above 160 K. We propose a mechanism based on collision-assisted recombination, where self-trapped excitons are first delocalized and then partially ionized into free polarons as the temperature increases, giving rise to the acceleration of the population decay.
Authors
- Iryna Gozhyk (ORCID: https://orcid.org/0000-0002-8287-307X)
- Matteo Balestrieri (ORCID: https://orcid.org/0000-0001-5740-0433)
- Mathieu Gallart (ORCID: https://orcid.org/0000-0001-7887-7556)
- Hervé Montigaud (ORCID: https://orcid.org/0000-0003-3462-405X)
- P. Gilliot (ORCID: https://orcid.org/0000-0002-9632-0652)
- Adrien Girault (ORCID: https://orcid.org/0000-0001-9615-7747)
- Olivier Crégut (ORCID: https://orcid.org/0009-0005-1261-3191)
- Marc Ziégler (ORCID: https://orcid.org/0009-0001-5223-8657)
- Davide Sciacca
Institutions
- Saint-Gobain (France) (FR)
- Centre National de la Recherche Scientifique (FR)
- Université Sorbonne Nouvelle (FR)
- Surface du Verre et Interfaces (FR)
- Université de Strasbourg (FR)
Publication Details
- Journal
- Journal of Applied Physics
- Published
- 2025-11-13
- DOI
- https://doi.org/10.1063/5.0292326
- Primary Topic
- TiO2 Photocatalysis and Solar Cells
- Type
- article
- Field-Weighted Citation Impact
- 0.00