5 results on '"Smaïl Amari"'
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2. Moving Ions Vary Electronic Conductivity in Lead Bromide Perovskite Single Crystals through Dynamic Doping
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Antonio Guerrero, Eric Gros-Daillon, Marisé García-Batlle, Oriane Baussens, Julien Zaccaro, Jean-Marie Verilhac, Germà Garcia-Belmonte, Smaïl Amari, Universitat Jaume I, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Optique et Matériaux (OPTIMA), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), CEA Grenoble (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), DRT/LITEN/DTBH/LTH (CEA), European Project: Grant N°777222,PERXI, European Project: Grant n°871336,PeroXIS, and Optique et Matériaux (NEEL - OPTIMA)
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dynamic doping ,Materials science ,electronic conductivity ,Inorganic chemistry ,Doping ,Lead bromide ,ion dynamics ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Ion ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Electronic conductivity ,0210 nano-technology ,ComputingMilieux_MISCELLANEOUS ,hybrid perovskites ,Perovskite (structure) - Abstract
Metal halide perovskite single crystals are being explored as functional materials for a variety of optoelectronic applications. Among others, solar cells, field‐effect transistors, and X‐ and γ‐ray detectors have shown improved performance and stability. However, a general uncertainty exists about the relevant mechanisms governing the electronic operation. This is caused by the presence of mobile ions and how these defect species alter the internal electrical field, interact with the contact materials, or modulate electronic properties. Here, a set of high‐quality thick methylammonium lead tribromide single crystals contacted with low‐reactivity chromium electrodes are analyzed by impedance spectroscopy. Through examination of the sample resistance evolution with bias and releasing time, it is revealed that an interplay exists between the perovskite electronic conductivity and the defect distribution within the crystal bulk. Ion diffusion after bias removing changes the local doping density then governing the electronic transport. These findings indicate that the coupling between ionic and electronic properties relies upon a dynamic doping effect caused by moving ions that act as mobile dopants. In addition to electronic features, the analysis extracts values for the ion diffusivity in the range of 10−8 cm2 s−1 in good agreement with other independent
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- 2020
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3. Optimization of the Growth Conditions for High Quality CH 3 NH 3 PbBr 3 Hybrid Perovskite Single Crystals
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Smaïl Amari, Eric Gros d'Aillon, Jean-Marie Verilhac, Julien Zaccaro, Alain Ibanez, Optique et Matériaux (OPTIMA), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux (LITEN), Institut National de L'Energie Solaire (INES), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), European Project: Grant N°777222,PERXI, European Project: Grant n°871336,PeroXIS, Optique et Matériaux (NEEL - OPTIMA), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)
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Materials science ,010405 organic chemistry ,hybrid perovskite ,MAPbBr3 ,Crystal growth ,General Chemistry ,010402 general chemistry ,Condensed Matter Physics ,Model material ,01 natural sciences ,CH3NH3PbBr3 ,0104 chemical sciences ,Organic-Inorganic Halide Perovskite ,chemistry.chemical_compound ,Quality (physics) ,Crystal Growth ,Chemical engineering ,chemistry ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,General Materials Science ,structural defects ,Tribromide ,Crystalline quality ,Perovskite (structure) - Abstract
International audience; Organic-Inorganic Halide Perovskite, hybrid perovskite, CH3NH3PbBr3, MAPbBr3, Crystal Growth, Crystalline quality, structural defects ABSTRACT Methylammonium lead tribromide (CH3NH3PbBr3) single crystals has gained a growing attention in the past few years due to their use as model material to investigate relevant intrinsic perovskite properties, and for their potential applications for radiation detection. Their study has been facilitated by the ease and speed of fabrication of millimetric single crystals through a simple protocol of unseeded Inverse Temperature Crystallization (ITC). In this study, we show that such growing conditions suffer from both insufficient reproducibility regarding crystal quality and low yield of single crystal obtention. In particular, we observed that more than the half of crystals obtained by this technique are polycrystals. The structural defects of the rest single crystals obtained have been characterized by cross polarized light, surface chemical etching to reveal dislocations, X-ray diffraction, ICP-MS, and H-NMR. The results reveal a strong variability of crystals regarding to internal strains and dislocation densities. Such defects can further severely impact the electronic transport properties of these materials. A more robust and reproducible protocol is proposed based on seeded growth combined with appropriate temperature profile selected from continuous crystal growth monitoring. A clear improvement in crystal quality is reached with higher transparency, minimized internal strains and a low dislocations density in the range of 104 to 105 cm-2.
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- 2020
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4. Investigation on Chromium and PEDOT-PSS Electrodes on CH3NH3PbBr3 Single Crystals: Impact on Dark Current and X-ray Photocurrent
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Eric Gros-Daillon, Oriane Baussens, Alain Ibanez, Smaïl Amari, Julien Zaccaro, Jean-Marie Verilhac, and Pierre Rohr
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Photocurrent ,Chromium ,Materials science ,PEDOT:PSS ,chemistry ,business.industry ,Electrode ,X-ray ,Optoelectronics ,chemistry.chemical_element ,business ,Dark current - Published
- 2019
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5. An insight into the charge carriers transport properties and electric field distribution of CH3NH3PbBr3 thick single crystals
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Smaïl Amari, Julien Zaccaro, Eric Gros-Daillon, Jean-Marie Verilhac, Lionel Hirsch, Oriane Baussens, Loli Maturana, Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), DRT/LITEN/DTBH/LTH (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Optique et Matériaux (OPTIMA), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de l'intégration, du matériau au système (IMS), Université Sciences et Technologies - Bordeaux 1-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Optique et Matériaux (NEEL - OPTIMA), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)
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010302 applied physics ,Materials science ,Photon ,Physics and Astronomy (miscellaneous) ,Halide ,02 engineering and technology ,Electron ,021001 nanoscience & nanotechnology ,01 natural sciences ,Molecular physics ,Time of flight ,chemistry.chemical_compound ,Cross section (physics) ,chemistry ,Electric field ,0103 physical sciences ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Charge carrier ,0210 nano-technology ,Tribromide ,ComputingMilieux_MISCELLANEOUS - Abstract
Thanks to their unique combination of semiconducting properties and a large cross section for energetic photons, metal halide perovskites could theoretically achieve high x-ray to charge carriers conversion rates, making them materials of high interest for the direct x-ray detection. In this work, we focus on the transport properties of methylammonium lead tribromide (MAPbBr3) single crystals. Time of Flight measurements and x-ray focused experiments along the edge of the samples were carried out. We report homogenous holes transit throughout the thickness of the samples as well as poor electrons transit. We also report the continuity of the electric field throughout the thickness of the MAPbBr3 samples, and we present preliminary fitting results to discuss its nature.
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- 2020
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