| 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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Li, Yang
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2024Spin injection in graphene using ferromagnetic indium-cobalt van der Waals contacts
- 2024Sensitivity of G0 and stress-strain relation of geomaterials to grain shape and surface roughness
- 2024Triple-junction perovskite–perovskite–silicon solar cells with power conversion efficiency of 24.4%
- 2023Study of surface damage in silicon by irradiation with focused rubidium ions using a cold-atom ion sourcecitations
- 2023Near-surface characterization using Distributed Acoustic Sensing in an urban area: Granada, Spain
- 2023Bright circularly polarized photoluminescence in chiral layered hybrid lead-halide perovskitescitations
- 2023Evaporated Self‐Assembled Monolayer Hole Transport Layers: Lossless Interfaces in <i>p‐i‐n</i> Perovskite Solar Cellscitations
- 2023Silver contamination and its toxicity and risk management in terrestrial and aquatic ecosystemscitations
- 2022Fiber orientation dependence of tribological behavior of short carbon fiber reinforced ceramic matrix compositescitations
- 2022Elastic and inelastic mean free paths for scattering of fast electrons in thin-film oxidescitations
- 2021Premelting and formation of ice due to Casimir-Lifshitz interactions: Impact of improved parameterization for materials ; ENEngelskEnglishPremelting and formation of ice due to Casimir-Lifshitz interactions: Impact of improved parameterization for materialscitations
- 2021Exciton versus free carrier emission: Implications for photoluminescence efficiency and amplified spontaneous emission thresholds in quasi-2D and 3D perovskitescitations
- 2020Rapid and cytocompatible cell-laden silk hydrogel formation via riboflavin-mediated crosslinking
- 2020Rapid and cytocompatible cell-laden silk hydrogel formation via riboflavin-mediated crosslinkingcitations
- 2019Electrochemical metallization ReRAMs (ECM) - Experiments and modellingcitations
- 2019Volumetric Bioprinting of Complex Living-Tissue Constructs within Secondscitations
- 2018Magnetically activated microcapsules as controlled release carriers for a liquid PDMS cross-linkercitations
- 2016Transient phases during fast crystallization of organic thin films from solutioncitations
- 2014Design of anodic aluminum oxide rear surface plasmonic heterostructures for light trapping in thin silicon solar cellscitations
- 2012Characterization of epitaxial GaAs MOS capacitors using atomic layer-deposited TiO2/Al2O3gate stack: study of Ge auto-doping and p-type Zn doping
- 2009Lanthanide N,N '-piperazine-bis(methylenephosphonates) (Ln = La, Ce, Nd) that display flexible frameworks, reversible hydration and cation exchangecitations
- 2007Confinement of Thermoresponsive Hydrogels in Nanostructured Porous Silicon Dioxide Templatescitations
- 2007Confinement of Thermoresponsive Hydrogels in Nanostructured Porous Silicon Dioxide Templatescitations
- 2005Synthesis and characterization of CdS quantum dots in polystyrene microbeadscitations
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article
Exciton versus free carrier emission: Implications for photoluminescence efficiency and amplified spontaneous emission thresholds in quasi-2D and 3D perovskites
Abstract
Among perovskite semiconductors, quasi-two-dimensional (2D) materials are attractive for the pursuit of electrically driven lasing given their excellent performance in light-emitting diodes (LEDs) and their recent success in continuous-wave optically pumped lasing. We investigate the spontaneous photoluminescence emission and amplified spontaneous emission (ASE) of a series of quasi-2D emitters, and their directly analogous 3D materials formed by removing the 2D organic spacer by annealing. Although the PL photoluminescence (PL) (at low optical excitation power) from quasi-2D films with high 2D spacer fractions can be much brighter than that from their 3D counterparts, the ASE thresholds of these quasi-2D materials tend to be higher. This counter-intuitive behavior is investigated through time-resolved photophysical studies, which reveal the emission in the high-spacer-content quasi-2D perovskite can be exclusively excitonic, and the exciton–exciton annihilation of quasi-2D perovskite starts to take over the exciton dynamics at a low exciton density (<10$^{16}$ cm$^{-3}$). To lower ASE thresholds in quasi-2D materials it is necessary to increase the volume fraction of thick quantum wells, which we achieve by decreasing the spacer content or by utilizing 1-naphthylmethylamine (NMA) linkers. The increase of the volume fraction of thick quantum wells correlates with an increased contribution of free carrier recombination to the emission process of the quasi-2D materials. These results suggest that material development of quasi-2D materials for gain applications should target fast free charge carrier recombination rates by engineering the well thickness and size and not maximum photoluminescence quantum yields under low power excitation.