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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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Marongiu, Daniela
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (27/27 displayed)
- 2024Dynamic Disorder in Monolayer and Multilayer 2D Ruddlesden–Popper Lead Iodide Perovskites: Evidence from Solid-State Nuclear Magnetic Resonance and Ultrafast Optical Spectroscopy
- 2024Recent Advances in Perovskite Single-Crystal Thin Film Optoelectronic Devicescitations
- 2024Photoconduction in 2D Single‐Crystal Hybrid Perovskitescitations
- 2023Stabilization of Inorganic Perovskite Solar Cells with a 2D Dion–Jacobson Passivating Layercitations
- 2023Stabilisation of Inorganic Perovskite Solar Cells with A 2d Dion-Jacobson Passivating Layercitations
- 2023Stabilisation of Inorganic Perovskite Solar Cells with A 2d Dion-Jacobson Passivating Layercitations
- 2023Exciton dissociation in 2D layered metal-halide perovskitescitations
- 2022White light emission with unity efficiency from Cs 2 Na 1−x Ag x In 1−y Bi y Cl 6 double perovskites:the role of bismuth and silvercitations
- 2022Direct measurement of radiative decay rates in metal halide perovskites†citations
- 2022White light emission with unity efficiency from Cs2Na1−xAgxIn1−yBiyCl6 double perovskitescitations
- 2022Direct measurement of radiative decay rates in metal halide perovskitescitations
- 2021A new photophysics for 2D and 3D lead halide perovskites: Polaron plasma in equilibrium with bright excitons
- 2021Combined Experimental/Theoretical Study on the Luminescent Properties of Homoleptic/Heteroleptic Erbium(III) Anilate-Based 2D Coordination Polymerscitations
- 2021Long-lived electrets and lack of ferroelectricity in methylammonium lead bromide CH3NH3PbBr3 ferroelastic single crystalscitations
- 2019Photoluminescence Emission Induced by Localized States in Halide Passivated Colloidal Two-Dimensional WS2 Nanoflakes
- 2019Bifacial Diffuse Absorptance of Semitransparent Microstructured Perovskite Solar Cellscitations
- 2018Perovskite Excitonics:Primary Exciton Creation and Crossover from Free Carriers to a Secondary Exciton Phasecitations
- 2018Direct or indirect bandgap in hybrid lead halide perovskites?citations
- 2018Perovskite Excitonics: Primary Exciton Creation and Crossover from Free Carriers to a Secondary Exciton Phasecitations
- 2018Novel physical vapor deposition approach to hybrid perovskites: Growth of MAPbI3 thin films by RF-magnetron sputteringcitations
- 2017Self-Assembled Lead Halide Perovskite Nanocrystals in a Perovskite Matrixcitations
- 2016Paving the way for solution- processable perovskite laserscitations
- 2015Absorption f-sum rule for the exciton binding energy in methylammonium lead halide perovskitescitations
- 2014Colloidal Bi2S3 nanocrystals: Quantum size effects and midgap statescitations
- 2014Correlated electron-hole plasma in organometal perovskitescitations
- 2012Pore-confined synthesis of mesoporous nanocrystalline La–Ce phosphate films for sensing applicationscitations
- 2010An Alternative Sol–gel Route for the Preparation of Thin Films in CeO2–TiO2 Binary Systemcitations
Places of action
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article
Direct measurement of radiative decay rates in metal halide perovskites†
Abstract
The rate of light emission per unit carrier concentration, or radiative rate, is a fundamental semiconductor parameter that determines the limit photoconversion efficiency of solar cells. In hybrid perovskites, a champion materials class for photovoltaics, optical emission results from a bimolecular process, so that the radiative rate depends on the carrier density and cannot be directly measured with standard techniques. Instead, it is estimated either from UV-Vis absorption or from the kinetics of photoexcitation decays in time-resolved spectroscopy experiments. In this work, an ultrafast radiometric experiment is introduced to directly assess the radiative decay rate in perovskite thin films through a calibrated measurement of the instantaneous photoluminescence flux under pulsed laser excitation. The measured radiative decay rate is found to be significantly lower than the second order decay constant determined from photoluminescence decay kinetics, contrary to what is often assumed; it is also 50-100 times slower than estimates for a plasma of free excitons and free charged carriers, obtained from absorption coefficients through optical reciprocity relations. We attribute the microscopic origin of the measured low radiative rate to the formation of a population of dark excitations, specifically large polarons. Our results provide a coherent framework to rationalize radiative and non-radiative carrier recombination processes in metal halide perovskites, as well as the photophysical basis to optimize device performances for this emerging class of semiconductors.