| 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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Pau, Riccardo
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2024Photophysics and optoelectronics of metal halide perovskites and other unconventional semiconductors
- 2024Dynamic Disorder in Monolayer and Multilayer 2D Ruddlesden–Popper Lead Iodide Perovskites: Evidence from Solid-State Nuclear Magnetic Resonance and Ultrafast Optical Spectroscopy
- 2023Exciton dissociation in 2D layered metal-halide perovskitescitations
- 2023Air- and water-stable and photocatalytically active germanium-based 2D perovskites by organic spacer engineeringcitations
- 2023Air- and water-stable and photocatalytically active germanium-based 2D perovskites by organic spacer engineeringcitations
- 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
- 2017Self-Assembled Lead Halide Perovskite Nanocrystals in a Perovskite Matrixcitations
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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.