Carrier-assisted recombination in anatase TiO2
Abstract
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.
Article Details
Journal Info
Journal of Applied Physics
American Institute of Physics
Authors (9)
Marc Ziegler
IPCMS UMR7504 CNRS—Université de Strasbourg 1 , 23, rue du Lœss B.P. 43, F-67034 Strasbourg CEDEX 2,
Adrien Girault
IPCMS UMR7504 CNRS—Université de Strasbourg 1 , 23, rue du Lœss B.P. 43, F-67034 Strasbourg CEDEX 2,
Olivier Crégut
IPCMS UMR7504 CNRS—Université de Strasbourg 1 , 23, rue du Lœss B.P. 43, F-67034 Strasbourg CEDEX 2,
Matteo Balestrieri
Surface du Verre et Interfaces, UMR 125 CNRS/Saint-Gobain Recherche 2 , 41, quai Lucien Lefranc, F-93303 Aubervilliers Cedex,
Iryna Gozhyk
Surface du Verre et Interfaces, UMR 125 CNRS/Saint-Gobain Recherche 2 , 41, quai Lucien Lefranc, F-93303 Aubervilliers Cedex,
Hervé Montigaud
Surface du Verre et Interfaces, UMR 125 CNRS/Saint-Gobain Recherche 2 , 41, quai Lucien Lefranc, F-93303 Aubervilliers Cedex,
Davide Sciacca
Saint-Gobain Research Paris 3 , 41, quai Lucien Lefranc, F-93303 Aubervilliers CEDEX,
Mathieu Gallart
IPCMS UMR7504 CNRS—Université de Strasbourg 1 , 23, rue du Lœss B.P. 43, F-67034 Strasbourg CEDEX 2,
Pierre Gilliot
IPCMS UMR7504 CNRS—Université de Strasbourg 1 , 23, rue du Lœss B.P. 43, F-67034 Strasbourg CEDEX 2,