A5000693004- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Solid-state spectroscopy and crystallography
- Organic Light-Emitting Diodes Research
- Luminescence and Fluorescent Materials
- Optical properties and cooling technologies in crystalline materials
- Conducting polymers and applications
- Thermal Expansion and Ionic Conductivity
- Microwave Dielectric Ceramics Synthesis
- Photonic Crystals and Applications
- Advanced Photonic Communication Systems
- Atomic and Subatomic Physics Research
- 2D Materials and Applications
- ZnO doping and properties
- Advanced Photocatalysis Techniques
- Metamaterials and Metasurfaces Applications
Universidade de Vigo
2021-2025
Italian Institute of Technology
2024
Galicia Sur Biomedical Foundation
2021
Servicio Gallego de Salud
2021
Abstract Lead‐halide perovskites (LHPs), in the form of both colloidal nanocrystals (NCs) and thin films, have emerged over past decade as leading candidates for next‐generation, efficient light‐emitting diodes (LEDs) solar cells. Owing to their high photoluminescence quantum yields (PLQYs), LHPs efficiently convert injected charge carriers into light vice versa. However, despite defect‐tolerance LHPs, defects at surface NCs grain boundaries films play a critical role charge‐carrier...
Abstract Over the past few years, lead‐halide perovskites (LHPs), both in form of bulk thin films and colloidal nanocrystals (NCs), have revolutionized field optoelectronics, emerging at forefront next‐generation optoelectronics. The power conversion efficiency (PCE) halide perovskite solar cells has increased from 3.8% to over 25.7% a short period time is very close theoretical limit (33.7%). At same time, external quantum (EQE) LEDs surpassed 23% 20% for green red emitters, respectively....
The versatile hybrid perovskite nanocrystals (NCs) are one of the most promising materials for optoelectronics by virtue their tunable bandgaps and high photoluminescence (PL) quantum yields. However, inherent crystalline chemical structure limits chiroptical properties achievable with material. production chiral perovskites has become an active field research its applications in optics, chemistry, or biology. Typically, halide obtained incorporation different moieties Unfortunately, these...
This work focuses on the systematic investigation of shape, size, and composition-controlled synthesis perovskite nanocrystals (NCs) under inert gas-free conditions using pre-synthesized precursor stock solutions. In case CsPbBr3 NCs, we find that lowering reaction temperature from ∼175 to 100 °C initially leads a change morphology bulk-like 3D nanocubes 0D with 3D-quantum confinement, while at temperatures below yields 2D nanoplatelets (NPls) 1D-quantum confinement. However, our surprise,...
Colloidal lead-halide perovskite nanocrystals (LHP NCs) have emerged over the past decade as leading candidates for efficient next-generation optoelectronic devices, but their properties and performance critically depend on how they are purified. While antisolvents widely used purification, a detailed understanding of polarity antisolvent influences surface chemistry composition NCs is missing in field. Here, we fill this knowledge gap by studying purified CsPbBr
We report here fast A-site cation cross-exchange between APbX3 perovskite nanocrystals (NCs) made of different A-cations (Cs (cesium), FA (formamidinium), and MA (methylammonium)) at room temperature. Surprisingly, the A-cation proceeds as halide (X=Cl, Br, or I) exchange with help free A-oleate complexes present in freshly prepared colloidal NC solutions. This enabled preparation double (MACs, MAFA, CsFA)- triple (MACsFA)-cation NCs an optical band gap that is finely tunable by their...
Abstract Defect tolerance is a critical enabling factor for efficient lead-halide perovskite materials, but the current understanding primarily on band-edge (cold) carriers, with significant debate over whether hot carriers can also exhibit defect tolerance. Here, this important gap in field addressed by investigating how intentionally-introduced traps affect carrier relaxation CsPbX 3 nanocrystals (X = Br, I, or mixture). Using femtosecond interband and intraband spectroscopy, along...
Abstract In recent years, the field of metal-halide perovskite emitters has rapidly emerged as a new community in solid-state lighting. Their exceptional optoelectronic properties have contributed to rapid rise external quantum efficiencies (EQEs) light-emitting diodes (PeLEDs) from <1% (in 2014) over 30% 2023) across wide range wavelengths. However, several challenges still hinder their commercialization, including relatively low EQEs blue/white devices, limited large-area poor device...
We report a colloidal synthesis of blue emissive, stable cube-shaped CsPbBr3 quantum dots (QDs) in the strong confinement regime via dissolution-recrystallization starting from pre-synthesized (KxCs1-x)4PbBr6 nanocrystals which are then reacted with PbBr2. This is markedly different known case Cs4PbBr6 that react within seconds PbBr2 and get transformed into much larger, green emitting nanocrystals. Here, instead, conversion to QDs occurs time span hours, tuning size achieved by adjusting...
We report the synthesis of nanocrystal heterostructures composed CsPbCl
Halide perovskites have emerged at the forefront of semiconductor materials for photovoltaic and light-emitting devices. However, long-term stability toxicity are major barriers to their commercialization. In particular, lead (Pb) its environmental impact prompted exploration lead-free alternatives like tin (Sn) bismuth (Bi). Herein, a cytotoxicity study Pb-based perovskite (CsPbBr3 CsPbI3) Cs2AgBiBr6 nanocrystals in lung liver cell lines blood cells reported, revealing that both Pb Bi...
In this study, we synthesized a phosphonium-based ligand, trimethyl(tetradecyl)phosphonium bromide (TTP-Br), and employed it in the postsynthesis surface treatment of Cs-oleate-capped CsPbBr3 nanocrystals (NCs). The photoluminescence quantum yield (PLQY) NCs increased from ∼60% to more than 90% as consequence replacing Cs-oleate with TTP-Br ligand pairs. Density functional theory calculations revealed that TTP+ ions bind NC by occupying Cs+ sites orienting one their P-CH3 bonds perpendicular...
Abstract Lead halide perovskite nanocrystals (LHP NCs) are generally prone to surface defect formation during the purification process, resulting in a reduced photoluminescence (PL) quantum yield. The of LHP NCs using antisolvents leads detachment atoms and ligandsin form alkylammonium‐halides or A‐carboxylates (A: Cs, methylammonium, MA, formamidinium, FA. Currently, intense research is being carried out improve stability various long‐chain organic ligands that strongly bind NCs. Herein,...
Abstract The recent emergence of quantum‐confined nanomaterials in the field radiation detection, particular lead halide perovskite nanocrystals, offers scalability and performance advantages over conventional materials. This development raises fundamental questions about mechanism scintillation itself at nanoscale role particle size, arguably most defining parameter quantum dots. Understanding this is crucial for design optimization future nanotechnology scintillators. In work, these open...
Abstract We report here fast A‐site cation cross‐exchange between APbX 3 perovskite nanocrystals (NCs) made of different A‐cations (Cs (cesium), FA (formamidinium), and MA (methylammonium)) at room temperature. Surprisingly, the A‐cation proceeds as halide (X=Cl, Br, or I) exchange with help free A‐oleate complexes present in freshly prepared colloidal NC solutions. This enabled preparation double (MACs, MAFA, CsFA)‐ triple (MACsFA)‐cation NCs an optical band gap that is finely tunable by...
The recent emergence of quantum confined nanomaterials in the field radiation detection, particular lead halide perovskite nanocrystals, offers potentially revolutionary scalability and performance advantages over conventional materials. This development raises fundamental questions about mechanism scintillation itself at nanoscale role particle size, arguably most defining parameter dots. Understanding this is crucial for design optimisation future nanotechnology scintillators. In work, we...
Abstract Cesium lead halide perovskite nanocrystals have emerged as one of the most promising candidates for manufacturing portable lasers and light sources. In order to harness exploit their photoluminescence more effectively, are often accompanied by a photonic scheme that improves emission. this work, quasi‐3D crystal is introduced which composed 2D‐grating on top distributed Bragg reflector (DBR) provides greater enhancement than isolated architectures alone. The crystals support both...
Abstract This work focuses on the systematic investigation of shape, size, and composition‐controlled synthesis perovskite nanocrystals (NCs) under inert gas‐free conditions using pre‐synthesized precursor stock solutions. In case CsPbBr 3 NCs, we find that lowering reaction temperature from ∼175 to 100 °C initially leads a change morphology bulk‐like 3D nanocubes 0D with 3D‐quantum confinement, while at temperatures below yields 2D nanoplatelets (NPls) 1D‐quantum confinement. However, our...
Defect tolerance is a critical enabling factor for efficient lead-halide perovskite materials, but the current understanding primarily on band-edge (cold) carriers, with significant debate over whether hot carriers (HCs) can also exhibit defect tolerance. Here, this important gap in field addressed by investigating how internationally-introduced traps affect HC relaxation CsPbX3 nanocrystals (X = Br, I, or mixture). Using femtosecond interband and intraband spectroscopy, along...
In recent years, the field of metal-halide perovskite emitters has rapidly emerged as a new community in solid-state lighting. Their exceptional optoelectronic properties have contributed to rapid rise external quantum efficiencies (EQEs) light-emitting diodes (PeLEDs) from <1% (in 2014) approaching 30% 2023) across wide range wavelengths. However, several challenges still hinder their commercialization, including relatively low EQEs blue/white devices, limited large-area poor device...