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Charge Carrier Recombination Dynamics of Semiconductor Photocatalyst

Author: Georgios Arnaoutakis, Massimo Cazzanelli, Zakaria El Koura, Antonio Miotello Wednesday, November 29, 2017
Photocatalysis, the induction of chemical changes by absorption of light, is crucial for many environmental studies and sought for water splitting and hydrogen production1,2, removal of pollutants3,4, as well as artificial photosynthesis5. With this wide spread of applications, earth-abundant photo-catalysts are attracting extensive interest, especially based on anatase TiO2 due to its abundance6,8 and low toxicity5,9. Due to its wide bandgap at 3.2 eV, however, it is not a good absorber in the visible range. Viable routes to extend its absorption include doping with transition metals to induce defect states in the lattice and tune the bandgap towards the visible. In this application note, by means of time-resolved photoluminescence spectroscopy, we study the dynamics of charge carriers in copper-nitrogen-titanium oxide (Cu-N-TiO2).

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