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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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Cortecchia, Daniele
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024How Photogenerated I 2 Induces I-Rich Phase Formation in Lead Mixed Halide Perovskitescitations
- 2024Stabilizing Single‐Source Evaporated Perovskites with Organic Interlayers for Amplified Spontaneous Emissioncitations
- 2024How Photogenerated I2 Induces I-Rich Phase Formation in Lead Mixed Halide Perovskitescitations
- 2024Recent developments in low-dimensional heterostructures of halide perovskites and metal chalcogenides as emergent materials: Fundamental, implementation, and outlookcitations
- 2023How Photogenerated I2 Induces I‐rich Phase Formation in Lead Mixed Halide Perovskitescitations
- 2023Tuning Structure and Excitonic Properties of 2D Ruddlesden–Popper Germanium, Tin, and Lead Iodide Perovskites via Interplay between Cationscitations
- 2023Structural effects on the luminescence properties of CsPbI 3 nanocrystalscitations
- 2021Coordinating Solvent-Assisted Synthesis of Phase-Stable Perovskite Nanocrystals with High Yield Production for Optoelectronic Applicationscitations
- 2020Large Polaron Self-Trapped States in Three-Dimensional Metal-Halide Perovskitescitations
- 2020Humidity-robust scalable metal halide perovskite film deposition for photovoltaic applicationscitations
- 2019Solution Processed Polymer-ABX4 Perovskite-Like Microcavitiescitations
- 2019All-polymer methylammonium lead iodide perovskite microcavitiescitations
- 2018Engineering the Emission of Broadband 2D Perovskites by Polymer Distributed Bragg Reflectorscitations
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article
How Photogenerated I2 Induces I-Rich Phase Formation in Lead Mixed Halide Perovskites
Abstract
<p>Bandgap tunability of lead mixed halide perovskites (LMHPs) is a crucial characteristic for versatile optoelectronic applications. Nevertheless, LMHPs show the formation of iodide-rich (I-rich) phase under illumination, which destabilizes the semiconductor bandgap and impedes their exploitation. Here, it is shown that how I<sub>2</sub>, photogenerated upon charge carrier trapping at iodine interstitials in LMHPs, can promote the formation of I-rich phase. I<sub>2</sub> can react with bromide (Br<sup>−</sup>) in the perovskite to form a trihalide ion I<sub>2</sub>Br<sup>−</sup> (I<sup>δ−</sup>-I<sup>δ+</sup>-Br<sup>δ−</sup>), whose negatively charged iodide (I<sup>δ−</sup>) can further exchange with another lattice Br<sup>−</sup> to form the I-rich phase. Importantly, it is observed that the effectiveness of the process is dependent on the overall stability of the crystalline perovskite structure. Therefore, the bandgap instability in LMHPs is governed by two factors, i.e., the density of native defects leading to I<sub>2</sub> production and the Br<sup>−</sup> binding strength within the crystalline unit. Eventually, this study provides rules for the design of chemical composition in LMHPs to reach their full potential for optoelectronic devices.</p>