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Publication

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

Majed Chergui, Michel Rossi, Mercedes Hannelore Rittmann-Frank, Fabio Giacomo Santomauro
2013
Journal Articles

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.

Official source

https://infoscience.epfl.ch/entities/publication/5086dc9a-8b36-4bcc-89cc-08f79f28da89

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Majed Chergui, Michel Rossi, Mercedes Hannelore Rittmann-Frank, Fabio Giacomo Santomauro
2013
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5086dc9a-8b36-4bcc-89cc-08f79f28da89

About this result

Related concepts (15)

Band gap

In solid-state physics and solid-state chemistry, a band gap, also called a bandgap or energy gap, is an energy range in a solid where no electronic states exist. In graphs of the electronic band structure of solids, the band gap refers to the energy difference (often expressed in electronvolts) between the top of the valence band and the bottom of the conduction band in insulators and semiconductors. It is the energy required to promote an electron from the valence band to the conduction band.

Direct and indirect band gaps

In semiconductor physics, the band gap of a semiconductor can be of two basic types, a direct band gap or an indirect band gap. The minimal-energy state in the conduction band and the maximal-energy state in the valence band are each characterized by a certain crystal momentum (k-vector) in the Brillouin zone. If the k-vectors are different, the material has an "indirect gap". The band gap is called "direct" if the crystal momentum of electrons and holes is the same in both the conduction band and the valence band; an electron can directly emit a photon.

Electronic band structure

In solid-state physics, the electronic band structure (or simply band structure) of a solid describes the range of energy levels that electrons may have within it, as well as the ranges of energy that they may not have (called band gaps or forbidden bands). Band theory derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or molecules.

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