| 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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Walker, David
University of Warwick
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2024Untangling free carrier and exciton dynamics in layered hybrid perovskites using ultrafast optical and terahertz spectroscopycitations
- 2023Untangling free carrier and exciton dynamics in layered hybrid perovskites using ultrafast optical and terahertz spectroscopycitations
- 2023Operando X-ray and Post-mortem Investigations of Electrochemical Degradation in Single-crystalline LiNi0.8Mn0.1Co0.1O2–Graphite pouch cellscitations
- 2023Tetragonal Kondo Insulator EuCd2Sb2 Discovered via High Pressure High Temperature Synthesiscitations
- 2023Quantifying electrochemical degradation in single-crystalline LiNi0.8Mn0.1Co0.1O2–graphite pouch cells through operando X-ray and post-mortem investigations
- 2023Data for Influence of co-reactants on surface passivation by nanoscale hafnium oxide layers grown by atomic layer deposition on siliconcitations
- 2023Hafnium oxide : a thin film dielectric with controllable etch resistance for semiconductor device fabricationcitations
- 2020Ambient and high pressure CuNiSb₂citations
- 2019Advanced steam measurement techniques: a study of how electrical capacitance measurements are affected by the spatial positioning of water within wet steam
- 2018MnFe0.5Ru0.5O3: An Above-Room-Temperature Antiferromagnetic Semiconductorcitations
- 2018Synthesizing bijective lensescitations
- 2018Cs1−xRbxSnI3 light harvesting semiconductors for perovskite photovoltaicscitations
- 2018Cs 1-: X Rb x SnI 3 light harvesting semiconductors for perovskite photovoltaicscitations
- 2015Thermal, compositional, and compressional demagnetization of cementitecitations
- 2015Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructurescitations
- 2013Thin film LaYbO3 capacitive structures grown by pulsed laser depositioncitations
- 2001Synthesis and thermal decomposition of tetragonal RbClO4 and volume of fluid O2 from 2 to 9 GPacitations
Places of action
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article
Untangling free carrier and exciton dynamics in layered hybrid perovskites using ultrafast optical and terahertz spectroscopy
Abstract
<jats:title>Abstract</jats:title><jats:p>Layered hybrid perovskites (LPKs) are promising as alternatives or additives to 3D metal halide perovskites for optoelectronic applications including photovoltaic cells, LEDs and lasers due to their increased stability. However, high exciton binding energies in these materials mean that excitons are the majority species under the operating conditions of many devices. Although the efficiency of devices that incorporate LPKs has been increasing, much is still unknown about the interplay of excitons and free charge-carriers in these materials, which is vital information for understanding how optoelectronic properties dictate device efficiency. In this work, we employ optical pump/THz probe spectroscopy (OPTP) and visible transient absorption spectroscopy (TAS) to analyse the optoelectronic properties and charge-carrier dynamics of phenylethylammonium lead iodide (PEA)<jats:sub>2</jats:sub>PbI<jats:sub>4</jats:sub>. By combining these techniques, we are able to disentangle the contributions from excitons and free charge-carriers. We observe fast cooling of free charge-carriers and exciton formation on a timescale of ~400 fs followed by slower bimolecular recombination of residual free charge-carriers with a rate constant k<jats:sub>2</jats:sub> ~10<jats:sup>9</jats:sup> cm<jats:sup>3</jats:sup>s<jats:sup>-1</jats:sup>.Excitons recombine via two monomolecular processes with lifetimest<jats:sub>1</jats:sub> ~11 ps and t<jats:sub>2</jats:sub> ~83 ps. Furthermore, we detect signatures of exciton-phonon coupling in the transient absorption kinetic traces. These findings provide a new insight into the interplay between free charge carrier and excitons well as a possible mechanism to further understand the charge-carrier dynamics in LPKs.</jats:p>