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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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Motti, Silvia Genaro
University of Southampton
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024The role of chemical composition in determining the charge-carrier dynamics in (AgI)x(BiI3)yrudorffitescitations
- 2024Disentangling the effects of structure and lone-pair electrons in the lattice dynamics of halide perovskitescitations
- 2024Unraveling loss mechanisms arising from energy‐level misalignment between metal halide perovskites and hole transport layerscitations
- 2022Optoelectronic properties of mixed iodide−bromide perovskites from first-principles computational modeling and experimentcitations
- 2022Excellent long-range charge-carrier mobility in 2D perovskitescitations
- 2020CsPbBr3 nanocrystal films: deviations from bulk vibrational and optoelectronic propertiescitations
- 2019Controlling competing photochemical reactions stabilizes perovskite solar cellscitations
- 2019Defect activity in lead halide perovskitescitations
- 2018Iodine chemistry determines the defect tolerance of lead-halide perovskitescitations
- 2018Probing device degradation and electric fields in polymeric field-effect transistors by SFG vibrational spectroscopycitations
Places of action
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article
Iodine chemistry determines the defect tolerance of lead-halide perovskites
Abstract
<p>Metal-halide perovskites are outstanding materials for photovoltaics. Their long carrier lifetimes and diffusion lengths favor efficient charge collection, leading to efficiencies competing with established photovoltaics. These observations suggest an apparently low density of traps in the prototype methylammonium lead iodide (MAPbI<sub>3</sub>) contrary to the expected high defect density of a low-temperature, solution-processed material. Combining first-principles calculations and spectroscopic measurements we identify less abundant iodine defects as the source of photochemically active deep electron and hole traps in MAPbI<sub>3</sub>. The peculiar iodine redox chemistry leads, however, to kinetic deactivation of filled electron traps, leaving only short-living hole traps as potentially harmful defects. Under mild oxidizing conditions the amphoteric hole traps can be converted into kinetically inactive electron traps, providing a rationale for the defect tolerance of metal-halide perovskites. Bromine and chlorine doping of MAPbI<sub>3</sub> also inactivate hole traps, possibly explaining the superior optoelectronic properties of mixed-halide perovskites.</p>