A5090091915- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Optical properties and cooling technologies in crystalline materials
- Luminescence Properties of Advanced Materials
- Advanced Materials Characterization Techniques
- Electron and X-Ray Spectroscopy Techniques
- Metallurgical and Alloy Processes
- X-ray Diffraction in Crystallography
- Magnetic Properties of Alloys
- Inorganic Fluorides and Related Compounds
- Rare-earth and actinide compounds
- Advanced Chemical Physics Studies
- Advanced Memory and Neural Computing
- Crystallography and molecular interactions
- Porphyrin and Phthalocyanine Chemistry
- Radiation Detection and Scintillator Technologies
- 2D Materials and Applications
- Islamic Studies and History
- Technostress in Professional Settings
- Advanced Thermoelectric Materials and Devices
- Inorganic Chemistry and Materials
- Synthesis of Organic Compounds
- Transition Metal Oxide Nanomaterials
Italian Institute of Technology
2019-2024
University of Genoa
2019-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2020
Industriale Chimica (Italy)
2020
Delft University of Technology
2017-2018
Eindhoven University of Technology
2018
Tata Steel (Netherlands)
2018
Materials innovation institute
2018
IMEC
2017
Oak Ridge Associated Universities
1991
The fabrication of high‐quality cesium (Cs)/formamidinium (FA) double‐cation perovskite films through a two‐step interdiffusion method is reported. Cs x FA 1‐ PbI 3‐y(1‐ ) Br y(1‐ with different compositions are achieved by controlling the amount CsI and formamidinium bromide (FABr) in respective precursor solutions. effects incorporating + − on properties resulting performance corresponding solar cells systematically studied. Small area power conversion efficiency (PCE) 19.3% module (4 cm 2...
A detailed investigation into the synthesis of green-emitting powders Cs4PbBr6 and CsPbBr3 materials by antisolvent precipitation from CsBr–PbBr2 precursor solutions in dimethylformamide (DMF) dimethyl sulfoxide (DMSO) is reported. Various solvated lead bromide polybromide species (PbBr2, [PbBr3]−, [PbBr4]2–, possibly [PbBr5]3– or [PbBr6]4–) are detected optical absorbance emission spectroscopies. The solvodynamic size solution strongly solvent-dependent: ∼1 nm were DMSO, while significantly...
Under mild mechanical pressure, halide perovskites show enhanced optoelectronic properties. However, these improvements are reversible upon decompression, and permanent enhancements have yet to be realized. Here, we report antisolvent-assisted solvent acidolysis crystallization that enables us prepare methylammonium lead bromide single crystals showing intense emission at all four edges under ultraviolet light excitation. We study structural variations (edge-vs-center) in using micro-X-ray...
Abstract In recent years remarkable progress has been made on developing low‐dimensional perovskite‐related materials. particular, with the aim of going toward compounds low toxicity, various metal halide nanocrystals have synthesized and investigated. These nanocrystalline crystallize in a plethora structures dimensionalities, many cases exciting optical properties. Thanks to their photoluminescence emission, which is typically broad largely Stokes‐shifted, such can find applications indoor...
The solvent acidolysis crystallization technique is utilized to grow mixed dimethylammonium/methylammonium lead tribromide (DMA/MAPbBr3 ) crystals reaching the highest dimethylammonium incorporation of 44% while maintaining 3D cubic perovskite phase. These show suppression orthorhombic phase and a lower tetragonal-to-cubic phase-transition temperature compared MAPbBr3 . A distinct behavior observed in temperature-dependent photoluminescence properties DMA/MAPbBr3 due different organic cation...
Abstract All inorganic perovskite nanocrystals (CsPbX 3 NCs) have excellent optical properties with high quantum yield, size tunable absorption and emission spectra which makes them popular for a wide variety of applications. the commonly used synthesis techniques, such as hot injection ligand assisted reprecipitation method (LARP), use ‘good’ solvent dimethyl formamide, sulfoxide or octadecene to dissolve precursor salts. The CsPbX NCs formation is triggered either by rapid dissolved salt...
Three-dimensional intensity data were collected from a spherical crystal of V/sub 4/Al/sub 23/ by the moving crystal-stationary counter technique. Corrections made for effects absorption, dispersion, extinction, and anisotropic thermal motion atoms. The structure was refined method least squares difference syntheses to reliability index 0.057. placed on an absolute scale using only those reflections which (sin theta )/ lambda > 0.29 A/sup -1/ are relatively insensitive distribution outer...
We elucidate here the nature of emissive states in Rb7Sb3Cl16 nanocrystals (NCs) for which we report a synthesis. These NCs have crystal structure comprising both isolated [SbCl6]3– octahedra and [Sb2Cl10]4– dimers octahedra. The optical properties are compared with those Sb-doped Rb3InCl6 NCs, latter containing only remarkably similar behaviors two systems indicate that emission materials originates from Density functional theory calculations suggest optically active because local...
Lead-chloride perovskites are promising candidates for optoelectronic applications, such as visible-blind UV photodetection. It remains unclear how the deep defects in this wide-bandgap material impact carrier recombination dynamics. In work, we study defect properties of MAPbCl3 (MA = CH3NH3) based on photoluminescence (PL) measurements. Our investigations show that apart from intrinsic emission, four sub-bandgap emissions emerge, which very likely to originate radiative excitons bound...
Refined structural studies shine light on the factors favouring ion migration in layered methylammonium copper halide materials and their memory devices.
Tailoring the physical properties of hybrid lead metal halide APbX3 perovskites by means compositional engineering is one key factors contributing to development highly efficient and stable perovskite solar cells. While beneficial effects partial ionic replacement at A- X-sites are largely demonstrated, Pb2+ less explored. Here, we developed a solution-based procedure prepare thin films mixed-metal MAPb1-aMnaI3 perovskites. Although Mn2+ ions have size that can potentially fit in B-sites...
Using MeV ion irradiation, a PL enhancement effect of MAPbBr<sub>3</sub> single crystals is demonstrated.
One major concern toward the performance and stability of halide perovskite-based optoelectronic devices is formation metallic lead that promotes nonradiative recombination charge carriers. The origin being disputed whether it occurs during perovskite synthesis or only after light, electron, X-ray beam irradiation thermal annealing. Here, we show quantity detected in crystals depends on concentration composition precursor solution. Through a controlled crystallization process, grew...
A method of growth small single crystals which are nearly perfect spheres is presented. The corrections for absorption effects in crystal diffraction peak measurements most easily made with these crystals. Crystals several dlfferent diameters produced one operation, and intensity data taken from different size give information concerning the relative importance primary secondary extinction effects. (J.R.D.)
The crystal structures of (CH3NH3)2Cu(Cl1-xBrx)4 compounds have been investigated by means synchrotron powder X-ray diffraction and pair distribution function analysis at room temperature. As a result, new insights are gained about the structural properties these compounds, suggesting monoclinic symmetry (space group No. 14: P21/c - C_{2h}^{5}) induced co-operative orbital ordering produced Jahn-Teller distortion characterizing 3d9 Cu2+ ion. In contrast to previous studies, significant...