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

Jacinto Sá; Peter Friedli; Richard Geiger; Philippe Lerch; Mercedes H. Rittmann-Frank; Christopher J. Milne; Jakub Szlachetko; Fabio G. Santomauro; Jeroen A. van Bokhoven; Majed Chergui; Michel J. Rossi; Hans Sigg

doi:10.1039/C3AN36595F

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

Jacinto Sá,*^a Peter Friedli,^a Richard Geiger,^a Philippe Lerch,^a Mercedes H. Rittmann-Frank,^b Christopher J. Milne,^b Jakub Szlachetko,^ac Fabio G. Santomauro,^a Jeroen A. van Bokhoven,^ad Majed Chergui,^b Michel J. Rossi^a and Hans Sigg^a

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* Corresponding authors

^a Paul Scherrer Institute (PSI), 5232 Villigen-PSI, Switzerland
E-mail: hans.sigg@psi.ch, jacinto.sa@psi.ch
Tel: + 41 56 3104048

^b Laboratoire de Spectroscopie Ultrarapide, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

^c Institute of Physics, Jan Kochanowski University, 25-406 Kielce, Poland

^d Institute for Chemical and Bioengineering, ETH Zurich, Wolfgang-Pauli Strasse, 8093 Zurich, Switzerland

Abstract

The dynamics of TiO₂ 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 TiO₂ results in a lifetime of 5.9 ns.

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

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