Materials Today Communications, Journal Year: 2024, Volume and Issue: unknown, P. 111123 - 111123
Published: Nov. 1, 2024
Language: Английский
Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(16), P. 8095 - 8122
Published: Jan. 1, 2024
Reducing the dimensionality of lead-halide perovskite nanocrystals from 3D to 0D leads fascinating properties. This tutorial review discusses synthesis, optical properties and applications such strongly-confined quantum dots.
Language: Английский
Citations
25
Science, Journal Year: 2025, Volume and Issue: 387(6733)
Published: Jan. 30, 2025
Highly concentrated solutions of asymmetric semiconductor magic-sized clusters (MSCs) cadmium sulfide, selenide, and telluride were directed through a controlled drying meniscus front, resulting in the formation chiral MSC assemblies. This process aligned their transition dipole moments produced chiroptic films with exceptionally strong circular dichroism. G-factors reached magnitudes as high 1.30 for drop-cast 1.06 patterned films, approaching theoretical limits. By controlling evaporation geometry, various domain shapes sizes achieved, homochiral domains exceeding 6 square millimeters that smoothly between left- right-handed chirality. Our results uncovered fundamental relationships deposition processes, alignment supramolecular filaments constituents, connection to emergent properties.
Language: Английский
Citations
2
Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)
Published: June 28, 2024
The tunable properties of halide perovskite/two dimensional (2D) semiconductor mixed-dimensional van der Waals heterostructures offer high flexibility for innovating optoelectronic and photonic devices. However, the general robust growth high-quality monocrystalline perovskite/2D with attractive optical has remained challenging. Here, we demonstrate a universal heteroepitaxy strategy to synthesize library facet-specific single-crystalline (multi)heterostructures. obtained can be broadly tailored by selecting coupling layer interest, include perovskites varying from all-inorganic organic-inorganic hybrid counterparts, individual transition metal dichalcogenides or 2D heterojunctions. CsPbI
Language: Английский
Citations
12
Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)
Published: Sept. 16, 2024
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 energy-dependent photoluminescence measurements kinetic modelling, it found that are not universally tolerant , strongly correlated to of cold requiring shallow be present (as CsPbI ). It directly captured traps, instead going through an intermediate carrier, deeper cause faster cooling, reducing effects phonon bottleneck Auger reheating. This work provides insights into defects influence which will designing materials solar cells, multiexciton generation, optical gain media.
Language: Английский
Citations
10
Advanced Materials, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 7, 2025
Abstract The field of optoelectronic integrated circuits is actively developing reliable and efficient room‐temperature continuous‐wave (CW) lasers. CW‐pumped lasers combine the economical simple manufacturing processes colloidal semiconductor with stable output continuous pumping, enabling them to significantly impact However, development still severely challenged by limitations such as gain materials cavity structures. Consequently, a compromise, most proposed date have relied on another pulsed laser pumping source. In this study, self‐assembled topological that benefits from CW at room temperature. By utilizing an interfacial self‐assembly strategy, nanoplatelets (NPLs) are managed control collective orientation (face‐down or edge‐up), achieving controlled polarization amplified spontaneous emission for first time. Furthermore, precise over thickness single NPL layer demonstrated, which enables system offer extensive wavelength tunability (over 50 nm), ultra‐high 95%), good temporal stability. These metrics signify optimal performance level lasers, marking new era in solution processing systems circuit field.
Language: Английский
Citations
1
ACS Nano, Journal Year: 2025, Volume and Issue: unknown
Published: March 7, 2025
Light-emitting colloidal lead halide perovskite nanocrystals (PeNCs) are considered promising candidates for next-generation vivid displays. However, the operational stability of light-emitting diodes (LEDs) based on PeNCs is still lower than those polycrystalline films, which requires an understanding defect formation in PeNCs, both inside crystal lattice ("bulk") and at surface. Meanwhile, uncontrollable ion redistribution electrochemical reactions under LED operation can be severe, also related to bulk surface quality a well-designed device architecture boost carrier injection balance radiative recombination. In this review, we consider reconstruction by enhancing rigidity rationally selecting ligands. Degradation pathways applied voltage discussed, strategies avoid undesirable migration PeNC films. Subsequently, other critical issues hindering commercial application LEDs including toxicity Pb perovskites, scale-up deposition design active-matrix prototypes high-resolution modules.
Language: Английский
Citations
1
Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown
Published: March 3, 2025
Abstract In chiral hybrid perovskites (CHPs), the generation of polarized spin current and manipulation exciton recombination are expected to produce circularly electroluminescence (CP‐EL) through chiral‐induced selectivity (CISS). It opens a new avenue for developing single junction light‐emitting diodes (spin‐LEDs). The recent challenge lies primarily in balancing device performance CP‐EL polarization. Beyond this, blue spin‐LEDs have not been fully realized. lacks studies interior spin‐chiroptical properties. Herein, promising chirality transfer methodology is initiated fabricating sky‐blue (≈491 nm) using synthesized ionic liquids (CILs). They on one side yield material passivation, giving rise chiroptical (EL) An optimal external quantum efficiency (EQE) 13.0% with dissymmetry factor 0.158 obtained. Importantly, this method leads elevation orbit coupling (CISOC) strength up 0.9717 eV A, long decay lifetime over 1 ns A large approximately 75% achieved ambient conditions. This work unlocks spin‐LEDs, further construction spin‐chiroptics relationship.
Language: Английский
Citations
1
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Oct. 6, 2024
Abstract Stacking different layers into van der Waals heterostructures (vdWHs) provides an attractive approach to integrating intrinsic prominent properties of the constituents. Mixed‐dimensional vdWHs that can interact with external fields are particularly intriguing because they host interlayer excitons (IXs) and thereby exhibiting rich physical phenomena novel device behaviors. However, previous studies IXs have primarily focused on TMDs systems, leaving excitonic correlated physics in perovskite poorly understood. Here, 2D‐3D ((BA) 2 PbBr 4 ‐CsPbBr 3 ) single‐crystalline designed discover modulation effects IX states optical optoelectronic properties. Interestingly, exhibit a newly emerging emission at 546 nm obvious broadening phenomenon FWHM. The vdWHs‐based photodetectors display light‐state rectification behaviors change output photocurrents from fully off rectified after illumination, resulting high ratio up 24342 enhanced on/off 7000. results attributed presence states, which facilitate carrier hopping interfaces. This work establishes mixed‐dimensional heterolayers as highly adaptable platform for exciton research applications.
Language: Английский
Citations
8
ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(6), P. 2425 - 2433
Published: May 20, 2024
Ultrathin lead halide perovskite nanoplatelets (NPLs) can enable tunable emission across the entire visible spectrum of light. The band-gap tunability NPLs does not require composition engineering, so segregation be avoided. However, their photoluminescence quantum yield (PLQY) and optoelectronic applications are often hampered due to reversible protonation deprotonation conventional amine ligands. Herein, we demonstrate synthesis benzenesulfonate-terminated CsPbBr3 without use any amine, clarify nucleation growth mechanism. thickness amine-free is controlled with monolayer-level precision, thus, wavelength tuned between 437 504 nm. Amine-free solely terminated by a benzenesulfonate group, leading Cs-rich surface. exhibit PLQYs up 80%, slow charge carrier relaxation. This work offers comprehensive study surface chemistry ligand dynamics NPLs.
Language: Английский
Citations
5
The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: 129(2), P. 1270 - 1281
Published: Jan. 2, 2025
In recent years, there has been a surge of interest in two-dimensional (2D) lead halide perovskites (LHPs) due to their high potential for optoelectronic devices. There is experimental evidence that carriers and excitons are not totally confined these atomically thin 2D crystals, surrounded by organic ligands. Taking into account previous results on density functional theory calculations, we use the variational method k.p approach solve Hamiltonian nanoplatelets (NPLs) including quantum dielectric confinements, surface stress, Coulomb interaction, finite barrier potential. Essential characteristics such as exciton energy, binding reduced mass discussed two inorganic LHPs, CsPbBr3 CsPbI3, model systems. For NPL thickness comparable or smaller than Bohr radius, good agreement between experiment obtained energy. This achieved through consideration band offset surrounding ligands, coupled carrier dependence, showing studies which consider an infinite confinement largely overestimate energy NPLs. The environment emerges pivotal parameter influencing
Language: Английский
Citations
0