A5005601798- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
- Perovskite Materials and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Thin-Film Transistor Technologies
- Ion-surface interactions and analysis
- Quantum Dots Synthesis And Properties
- Nanowire Synthesis and Applications
- Semiconductor materials and devices
- Silicon Nanostructures and Photoluminescence
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Ancient Mediterranean Archaeology and History
- Archaeological and Historical Studies
- Optical properties and cooling technologies in crystalline materials
- Advancements in Semiconductor Devices and Circuit Design
- Gas Sensing Nanomaterials and Sensors
- TiO2 Photocatalysis and Solar Cells
- Stellar, planetary, and galactic studies
- ZnO doping and properties
- Medieval Architecture and Archaeology
- Advanced Photocatalysis Techniques
- Laser Material Processing Techniques
- Astronomical Observations and Instrumentation
- Analytical Chemistry and Sensors
Institute for Microelectronics and Microsystems
2016-2025
National Research Council
2016-2025
University of Catania
1997-2017
National Academies of Sciences, Engineering, and Medicine
2017
Azienda Ospedaliero-Universitaria Policlinico - Vittorio Emanuele
2011-2016
Istituto Nazionale di Fisica Nucleare, Sezione di Catania
1997-2010
Consorzio Roma Ricerche
2005-2006
STMicroelectronics (Italy)
2003
Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics
2002
Philips (Netherlands)
1999-2001
Single crystals represent a benchmark for understanding the bulk properties of halide perovskites. We have indeed studied dielectric function lead bromide perovskite single (MAPbBr3, CsPbBr3 and first time FAPbBr3) by spectroscopic ellipsometry in range 1-5 eV while varying temperature from 183 to 440 K. An extremely low absorption coefficient sub-band gap region was found, indicating high optical quality all three crystals. extracted band values through critical point analysis showing that...
The transient supersaturation in a system undergoing Ostwald ripening is related to the cluster formation energy ${E}_{\mathrm{fc}}$ as function of size $n$. We use this relation study energetics self-interstitial clusters Si. Measurements enhanced diffusion B Si-implanted Si are used determine $S(t)$, and inverse modeling derive ${E}_{\mathrm{fc}}(n)$. For with $n>15$, ${E}_{\mathrm{fc}}\ensuremath{\approx}0.8\mathrm{eV}$, close fault ${113}$ defects. $n<10$, typically 0.5 eV higher,...
Methylammonium lead iodide (CH3NH3PbI3) is an extensively used perovskite material with a remarkable potential for solar energy conversion. Despite its high photovoltaic efficiency, the suffers from fast degradation when aging in atmospheric conditions and/or under sunlight. Here we review principal mechanisms of CH3NH3PbI3, focusing on thermodynamic, environmental and polymorphic parameters that impact stability material. A critical analysis available data indicates ambient...
Agrivoltaics, integrating photovoltaic systems with crop cultivation, demands semitransparent solar modules to mitigate soil shadowing. Perovskite Solar Cells (PSC) offer competitive efficiency, low fabrication costs, and high transmittance, making them suitable for agrivoltaic applications. However, the impact of PSC light filtering on plant growth transcriptomics remains underexplored. This study investigates viability agronomic implications radicchio seedlings (Cichorium intybus var....
Abstract We investigate the degradation path of MAPbI 3 (MA=methylammonium) films over flat TiO 2 substrates at room temperature by means X‐ray diffraction, spectroscopic ellipsometry, photoelectron spectroscopy, and high‐resolution transmission electron microscopy. The dynamics is found to be similar in air under vacuum conditions, which leads conclusion that occurrence intrinsic thermodynamic mechanisms not necessarily linked humidity. process has an early stage, drives starting tetragonal...
Quantum confinement effects in silicon nanowires (SiNWs) are expected when their diameter is less than the size of free exciton (with a Bohr radius ∼5 nm) bulk silicon. However, synthesis represents considerable technological challenge. The vapor-liquid-solid (VLS) mechanism, mediated by metallic nanoclusters brought to eutectic liquid state, most widely used for its simplicity and control on SiNWs size, shape, orientation, density, surface smoothness. VLS growth often performed within...
Fostered by the top power conversion efficiencies (PCEs) of lab-scale devices, industrialization perovskite solar cells is underway. Nevertheless, intrinsically poor stability these materials still represents a major concern. Herein, inspired Nature, use β-carotene in proposed to mimic its role as protective pigment, occurs natural photosynthesis. Laser-mediated photostability (LMPS) assessment, Fourier-transform infrared spectra analysis acquired attenuate total reflectance (ATR-FTIR),...
Hole‐transporting layer‐free mesoporous carbon (mC) architectures represent a printable, low‐cost, and stable solution for the future commercialization of perovskite solar cells (PSCs). CsPbI 3 is attracting attention its inorganic structure, which yields higher structural stability compared to hybrid counterparts allows reversibility photoactive phase. Here photovoltaic performance large‐area (144 mm 2 ) devices infiltrated with :EuCl systematically evaluated, using AVA‐MAPbI mC‐PSCs as...
We study the optical response of CH3NH3PbI3 layers to light solicitation under different environmental gas and temperature conditions. The measurements were performed in nonreactive (Ar or N2) reactive (O2 humid air) range 40–80 °C crossing tetragonal–cubic transition (∼50 °C). With respect truly inert Ar, use N2 not only assures reversibility constants during thermal cycles but also improves material. While Ar atmospheres parameters material can be recovered at end cycle, contrast, presence...
Abstract On the basis of experiment and theory, a general paradigm is drawn that reconsiders N 2 not simply being an inert species but rather effective healing gas molecule if entering methylammonium lead iodide (MAPbI 3 ) layer. Nitrogen soaked into polycrystalline MAPbI via postdeposition mild thermal treatment under slightly overpressure conditions to promote its diffusion across whole A significant reduction radiative recombination concurrent increase light absorption, with maximum...
We investigated the complex dielectric function of bromide perovskite single crystals (MAPbBr3, FAPbBr3 and CsPbBr3) by spectroscopic ellipsometry from 1 to 5 eV in 183–423 K temperature range under a dry nitrogen environment. The dependence all critical points provided benchmark for interband electronic transition energies three perovskites wide spectral range. found that number transitions CsPbBr3 depends on crystallographic phase, with orthorhombic lattice showing an extra respect...
Optoelectronic devices operate under continuous thermal stress that may influence both long-term stability and optical properties of the active material. It is therefore useful to know elastic materials. In general, constants a material be deduced by measurement speed sound in this work, we report on measurements three lead-free halide perovskites, namely inorganic Cs3Bi2I9 hybrid MA3Bi2I9 MA3Sb2I9, means femtosecond transient reflectivity shows oscillations signal intensity are related...
The advance of innovative photovoltaics based on hybrid perovskites is currently forced to face their stability and durability through the rationalization phenomena occurring into lattice under conditions which mimic material operation. In this framework, we study structural modifications MAPbI3 layers by in situ optical analyses upon recursive thermal cycles from 30 80 °C different annealing environments. We reveal an acceleration modification, above what expected, as threshold tetragonal...
Halide perovskites containing a mixture of formamidinium (FA+), methylammonium (MA+) and cesium (Cs+) cations are the actual standard for obtaining record-efficiency perovskite solar cells. Although compositional tuning that brings to optimal performance devices has been largely established, little is understood on role even small quantities MA+ or Cs+ in stabilizing black phase FAPbI3 while boosting its photovoltaic yield. In this paper, we use Car-Parrinello molecular dynamics large...
The innovative two-step Low Vacuum-Proximity Space Effusion (LV-PSE) method exploits the conversion of a textured PbI<sub>2</sub> layer into MAPbI<sub>3</sub> by adsorption–incorporation–migration energetic MAI molecules, thus enabling best efficiency 17.5% in 150 nm thick layers.
A nanometric hybrid system consisting of a Fe3O4 magnetic nanoparticles modified through the growth Fe-based Metal-organic frameworks MIL (Materials Institute Lavoiser) was developed. The obtained retains both nanometer dimensions and properties possesses increased loading capability due to highly porous Fe-MIL. It tested load, carry release temozolomide (TMZ) for treatment glioblastoma multiforme one most aggressive deadly human cancers. chemical characterization performed various...
Abstract In this study, the optical behavior of lead‐free Bi‐based low‐dimensional perovskite single crystals (Cs 3 Bi 2 Cl 9 , Cs Br I and MA ) is investigated by spectroscopic ellipsometry, supported X‐ray diffraction density functional theory calculations. All materials exhibit a strong excitonic peak resulting from photogenerated electron–hole Coulomb interactions, whereas threshold continuous absorption found at higher energies. The resonances bands, along with exciton binding energies,...
We demonstrate that the depth distribution of defects in MeV implanted n-type and p-type crystalline Si is severely affected by impurity content material. Silicon samples with different concentrations dopants (P or B) intrinsic contaminants (i.e., C O) were 1 2 He ions to fluences range 2.5×108–1×1013/cm2. Using deep-level transient spectroscopy spreading resistance measurements, we have identified determined their concentration distribution. It found less than 4% generated beam escape...
Abstract We propose an up-scalable, reliable, contamination-free, rod-like TiO 2 material grown by a new method based on sputtering deposition concepts which offers multi-scale porosity, namely: intra-rods nano-porosity (1–5 nm) arising from the Thornton’s conditions and extra-rods meso-porosity (10–50 originating spatial separation of Titanium Oxygen sources combined with grazing Ti flux. The procedure is simple, since it does not require any template layer to trigger nano-structuring,...
Low-temperature nanostructured electron-transporting layers (ETLs) for perovskite solar cells are grown by reactive sputtering at 160 °C with thickness in the range 22–76 nm and further stabilization air 180 to improve lattice structure consequently reduce charge recombination during cell operation. In addition, post-deposition treatment aims leveling differences among samples ensure material reproducibility. Nanostructured TiO2 has a added value promoting structural coupling layer...
Excimer laser annealing (ELA) of ultra-low-energy (ULE) B-ion implanted Si has been performed. High-resolution transmission electron microscopy used to assess the as-implanted damage and crystal recovery following ELA. The electrical activation redistribution B in during ELA investigated as a function energy density (melted depth), implant dose, number pulses (melt time). activated retained dose evaluated with spreading resistance profiling secondary ion mass spectrometry. A significant...