Kinetics of electron build-up in TiO2 colloids probed by hole scavenging after picosecond excitation
Abstract
Excess electrons generated in the conduction band of colloidal TiO2 are trapped into n-type sites with a time constant of ca. 2 ns; this process is significantly slower than recombination of electrons and holes in the surface layer of the colloid at the concentrations of the experiment.