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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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Green, Martin A.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2020Transparent electrodes consisting of a surface-treated buffer layer based on tungsten oxide for semitransparent perovskite solar cells and four-terminal tandem applicationscitations
- 2020Unveiling the relationship between the perovskite precursor solution and the resulting device performancecitations
- 2018Scaling limits to large area perovskite solar cell efficiencycitations
- 2017Impact of microstructure on the electron-hole interaction in lead halide perovskitescitations
- 2016Temperature dependent optical properties of CH3NH3PbI3 perovskite by spectroscopic ellipsometrycitations
- 2015Polaronic exciton binding energy in iodide and bromide organic-inorganic lead halide perovskitescitations
- 2015Ultimate efficiency limit of single-junction perovskite and dual-junction perovskite/silicon two-terminal devicescitations
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article
Polaronic exciton binding energy in iodide and bromide organic-inorganic lead halide perovskites
Abstract
<p>The last 4 years have seen the rapid emergence of a new solar cell technology based on organic-inorganic lead halide perovskites, primarily CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>and related halides involving Cl and Br. Debate continues on the role of excitons and free carriers in these materials. Recent studies report values of exciton binding energy for the iodide ranging from 0.7 meV to 200 meV, with vastly different implications for device operation and design. In the present work, previously neglected polarons are shown likely to have a major impact in determining excitonic properties. Polaronic exciton binding energies calculated using effective longitudinal optical phonon energies, deduced from permittivity measurements, are shown consistent with experimental energies for good quality samples of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>and CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub>, as determined over a large temperature range from optical absorption data. Bandgaps determined simultaneously show a discontinuity at the orthorhombic to tetragonal phase transition for the iodide, but not for the bromide.</p>