| 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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Yin, Jun
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2023Anisotropic Superconducting Nb<sub>2</sub>CT<i><sub>x</sub></i> MXene Processed by Atomic Exchange at The Wafer Scalecitations
- 2023State of the Art and Prospects for Halide Perovskite Nanocrystals.
- 2023Zero-dimensional Cu(i)-based organometallic halide with green cluster-centred emission for high resolution X-ray imaging screenscitations
- 2021State of the art and prospects for halide perovskite nanocrystalscitations
- 2021State of the art and prospects for halide perovskite nanocrystalscitations
- 2020Large Polaron Self-Trapped States in Three-Dimensional Metal-Halide Perovskitescitations
- 2019Planar and van der Waals heterostructures for vertical tunnelling single electron transistorscitations
- 2018Ligand-Free Nanocrystals of Highly Emissive Cs4PbBr6 Perovskitecitations
- 2018Characterization of the Valence and Conduction Band Levels of n = 1 2D Perovskites: A Combined Experimental and Theoretical Investigationcitations
- 2018Growth of graphene on tantalum and its protective propertiescitations
- 2017Ultralow Self-Doping in 2D Hybrid Perovskite Single Crystalscitations
- 2017Ultralong Radiative States in Hybrid Perovskite Crystals: Compositions for Submillimeter Diffusion Lengthscitations
- 2015Surface electrical properties of stainless steel fibres: An AFM-based studycitations
- 2012Metal condensates for low-molecular-weight matrix-free laser desorption/ionizationcitations
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article
Characterization of the Valence and Conduction Band Levels of n = 1 2D Perovskites: A Combined Experimental and Theoretical Investigation
Abstract
This study presents a combined experimental and theoretical study of the electronic structure of two 2D metal halide perovskite films. Ultraviolet and inverse photoemission spectroscopies are performed on solution-processed thin films of the n = 1 layered perovskite butylammonium lead iodide and bromide, BA2PbI4 and BA2PbBr4, characterized by optical absorption and X-ray diffraction, to determine their valence and conduction band densities of states, transport gaps, and exciton binding energies. The electron spectroscopy results are compared with the densities of states determined by density functional theory calculations. The remarkable agreement between experiment and calculation enables a detailed identification and analysis of the organic and inorganic contributions to the valence and conduction bands of these two hybrid perovskites. The electron affinity and ionization energies are found to be 3.1 and 5.8 eV for BA2PbI4, and 3.1 and 6.5 eV for BA2PbBr4. The exciton binding energies are estimated to be 260 and 300 meV for the two materials, respectively. The 2D lead iodide and bromide perovskites exhibit significantly less band dispersion and a larger density of states at the band edges than the 3D analogs. The effects of using various organic ligands are also discussed.