Transient mid-IR study of electron dynamics in TiO2 conduction band

摘要

The dynamics of TiO_2 conduction band electrons were followed with a novel broadband synchrotron-based transient mid-IR spectroscopy setup. The lifetime of conduction band electrons was found to be dependent on the injection method used. Direct band gap excitation results in a lifetime of 2.5 ns, whereas indirect excitation at 532 nm via Ru-N719 dye followed by injection from the dye into TiO_2 results in a lifetime of 5.9 ns.