| 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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Kalendra, Vidmantas
Vilnius University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Effect of Particle Size on the Origin of Electromechanical Response in BaTiO 3 /PDMS Nanogeneratorscitations
- 2022Investigation of dielectric and magnetic properties of AL-800 ferritecitations
- 2022Origin of Relaxor Behavior in Barium‐Titanate‐Based Lead‐Free Perovskitescitations
- 2022Mixology of MA1- xEAxPbI3Hybrid Perovskitescitations
- 2022Phosphate bonded CoFe<sub>2</sub>O<sub>4</sub>–BaTiO<sub>3</sub> layered structures: Dielectric relaxations and magnetoelectric couplingcitations
- 2021Origin of Relaxor Behavior in Barium-Titanate-Based Lead-Free Perovskitescitations
- 2020Suppression of phase transitions and glass phase signatures in mixed cation halide perovskitescitations
- 2008Electrical conductivity of carbon nanotubes and polystyrene compositescitations
Places of action
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article
Mixology of MA1- xEAxPbI3Hybrid Perovskites
Abstract
<p>Mixing molecular cations in hybrid lead halide perovskites is a highly effective approach to enhance the stability and performance of optoelectronic devices based on these compounds. In this work, we prepare and study novel mixed 3D methylammonium (MA)-ethylammonium (EA) MA<sub>1-x</sub>EA<sub>x</sub>PbI<sub>3</sub>(x < 0.4) hybrid perovskites. We use a suite of different techniques to determine the structural phase diagram, cation dynamics, and photoluminescence properties of these compounds. Upon introduction of EA, we observe a gradual lowering of the phase-transition temperatures, indicating stabilization of the cubic phase. For mixing levels higher than 30%, we obtain a complete suppression of the low-temperature phase transition and formation of a new tetragonal phase with a different symmetry. We use broad-band dielectric spectroscopy to study the dielectric response of the mixed compounds in an extensive frequency range, which allows us to distinguish and characterize three distinct dipolar relaxation processes related to the molecular cation dynamics. We observe that mixing increases the rotation barrier of the MA cations and tunes the dielectric permittivity values. For the highest mixing levels, we observe the signatures of the dipolar glass phase formation. Our findings are supported by density functional theory calculations. Our photoluminescence measurements reveal a small change of the band gap upon mixing, indicating the suitability of these compounds for optoelectronic applications.</p>