| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Schmitt, Thorsten
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2024Anionic disorder and its impact on the surface electronic structure of oxynitride photoactive semiconductors
- 2023Momentum-resolved electronic structure of LaTiO2N photocatalysts by resonant Soft-X-ray ARPEScitations
- 2023k-dependent proximity-induced modulation of spin-orbit interaction in MoSe2 interfaced with amorphous Pb
- 2020The relevance of ARPES to high-Tc superconductivity in cuprates
- 2019Anisotropic magnetic excitations and incipient Néel order in Ba(Fe1−xMnx)2As2citations
- 2018Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K-edge resonant inelastic x-ray scatteringcitations
- 2017Weakly-Correlated nature of ferromagnetism in nonsymmorphic CrO2 revealed by bulk-sensitive soft-X-ray ARPEScitations
- 2014Self-doping processes between planes and chains in the metal-to-superconductor transition of YBa2Cu3O6.9citations
- 2011Resonant soft X-ray emission and X-ray absorption studies on Ga<sub>1-x</sub>Mn<sub>x</sub>N grown by pulsed laser depositioncitations
- 2011Unveiling the complex electronic structure of amorphous metal oxidescitations
- 2005Optical conductivity and x-ray absorption and emission study of the band structure of MnN filmscitations
Places of action
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article
Anionic disorder and its impact on the surface electronic structure of oxynitride photoactive semiconductors
Abstract
The conversion of solar energy into chemical energy, stored in the form of hydrogen, bears enormous potential as a sustainable fuel for powering emerging technologies. Photoactive oxynitrides are promising materials for splitting water into molecular oxygen and hydrogen. However, one of the issues limiting widespread commercial use of oxynitrides is the degradation during operation. While recent studies have shown the loss of nitrogen, its relation to the reduced efficiency has not been directly and systematically addressed with experiments. In this study, we demonstrate the impact of the anionic stoichiometry of BaTaO$_x$N$_y$ on its electronic structure and functional properties. Through experimental ion scattering, electron microscopy, and photoelectron spectroscopy investigations, we determine the anionic composition ranging from the bulk towards the surface of BaTaO$_x$N$_y$ thin films. This further serves as input for band structure computations modeling the substitutional disorder of the anion sites. Combining our experimental and computational approaches, we reveal the depth-dependent elemental composition of oxynitride films, resulting in downward band bending and the loss of semiconducting character towards the surface. Extending beyond idealized systems, we demonstrate the relation between the electronic properties of real oxynitride photoanodes and their performance, providing guidelines for engineering highly efficient photoelectrodes and photocatalysts for clean hydrogen production.