Abstract Metal halide perovskite semiconductors possess outstanding characteristics for optoelectronic applications including but not limited to photovoltaics. Low-dimensional and nanostructured motifs impart added functionality which can be exploited further. Moreover, wider cation composition tunability tunable surface ligand properties of colloidal quantum dot (QD) perovskites now enable unprecedented device architectures differ from thin-film fabricated solvated molecular precursors....

We report magnetic, dielectric, and magnetodielectric responses of the pure monoclinic bulk phase partially disordered ${\mathrm{La}}_{2}{\mathrm{NiMnO}}_{6}$, exhibiting a spectrum unusual properties establish that this compound is an intrinsically multiglass system with large coupling (8%--20%) over wide range temperatures (150--300 K). Specifically, our results unique way to obtain colossal magnetodielectricity, independent any striction effects, by engineering asymmetric hopping...

CsPbI3 nanocrystals with narrow size distributions were prepared to study the size-dependent properties. The adopt perovskite (over nonperovskite orthorhombic) structure improved stability over thin-film materials. Among phases (cubic α, tetragonal β, and orthorhombic γ), samples are characterized by γ phase, rather than but may have a average tilting between adjacent octahedra. Size-dependent lattice constants systematically vary 3% across range, unit cell volume increasing linearly inverse...

We present a cation-exchange approach for tunable A-site alloys of cesium (Cs+) and formamidinium (FA+) lead triiodide perovskite nanocrystals that enables the formation compositions spanning complete range Cs1- xFA xPbI3, unlike thin-film or direct synthesis alloyed nanocrystals. These materials show bright finely emission in red near-infrared between 650 800 nm. The activation energy miscibility Cs+ FA+ is measured (∼0.65 eV) shown to be higher than reported X-site exchange halide...

A detailed picture of temperature dependent behavior Cs

Colloidal metal halide perovskite nanocrystals (NCs) with chiral ligands are outstanding candidates as a circularly polarized luminescence (CPL) light source due to many advantages such high photoluminescence quantum efficiency, large spin-orbit coupling, and extensive tunability

ADVERTISEMENT RETURN TO ISSUECommunicationNEXTDirect Synthesis of Six-Monolayer (1.9 nm) Thick Zinc-Blende CdSe Nanoplatelets Emitting at 585 nmWooje ChoWooje ChoDepartment Chemistry, University Chicago, Illinois 60637, United StatesMore by Wooje Cho, Siyoung KimSiyoung KimInstitute for Molecular Engineering, Kim, Igor CoropceanuIgor CoropceanuDepartment Coropceanu, Vishwas SrivastavaVishwas SrivastavaDepartment Srivastava, Benjamin T. DirollBenjamin DirollCenter Nanoscale Materials, Argonne...

We report a detailed study on APbX3 (A = formamidinium (FA+), Cs+; X I–, Br–) perovskite quantum dots (PQDs) with combined A- and X-site alloying that exhibits both wide bandgap high open-circuit voltage (Voc) for the application of potential top cell in tandem junction photovoltaic (PV) devices. The nanocrystal affords control over optical is readily achieved by solution-phase cation anion exchange between previously synthesized FAPbI3 CsPbBr3 PQDs. Increasing only Br– content PQDs widens...

Extensively studied Mn-doped semiconductor nanocrystals have invariably exhibited photoluminescence over a narrow energy window of width $\ensuremath{\le}150\text{ }\text{ }\mathrm{meV}$ in the orange-red region and surprisingly large spectral ($\ensuremath{\ge}180\text{ }\mathrm{meV}$), contrary to its presumed atomic-like origin. Carrying out emission measurements on individual single supported by ab initio calculations, we show that Mn PL emission, fact, can (i) vary much wider range...

Doping of semiconductors enables fine control over the excess charge carriers, and thus overall electronic properties, crucial to many technologies. Controlled doping in lead-halide perovskite has far proven be difficult. However, lower dimensional perovskites such as nanocrystals, with their high surface-area-to-volume ratio, are particularly well-suited for via ground-state molecular transfer. Here, tunability properties nanocrystal arrays is detailed using physically adsorbed dopants....

In contrast to molecular systems, which are defined with atomic precision, nanomaterials generally show some heterogeneity in size, shape, and composition. The sample inhomogeneity translates into a distribution of energy levels, band gaps, work functions, other characteristics, detrimentally affect practically every property functional nanomaterials. We discuss novel synthetic strategy, colloidal layer deposition (c-ALD) stationary reactant phases, largely circumvents the limitations...

Abstract The excellent optoelectronic properties demonstrated by hybrid organic/inorganic metal halide perovskites are all predicated on precisely controlling the exact nucleation and crystallization dynamics that occur during film formation. In general, high‐performance thin films obtained a method commonly called solvent engineering (or antisolvent quench) processing. removes excess solvent, but importantly leaves behind forms chemical adducts with lead‐halide precursor salts. These...

Colloidal all-inorganic CsPbI3 perovskite quantum dots (PQDs) have shown tremendous potential in photovoltaic applications recent years due to their outstanding optoelectronic properties that general metal halide perovskites offer, along with the added advantages originates from size reduction and confinement effect. However, issue of low carrier mobility PQD films caused by insulating organic ligands capped on surface still remains be addressed while aiming for high-efficiency solar cells....

As lead halide perovskite (LHP) semiconductors have shown tremendous promise in many application fields, and particularly made strong impact the solar photovoltaic area, low dimensional quantum dot forms of these perovskites are showing potential to make distinct marks fields electronics, optoelectronics photonics. The so-called dots (PQDs) not only possess most important features LHP materials, i.e., unusual high defect tolerance, but also demonstrate clear size effects, along with...

We show that the characteristic Mn2+ d emission color from Mn2+-doped CdS nanocrystals can be tuned over as much 40 nm, in contrast to what should expected such a nearly localized d−d transition. This is achieved surprisingly by fine-tuning of host particle diameter 1.9 2.6 thereby changing overall red yellow. Systematic experiments conjunction with state-of-the-art ab initio calculations full geometry optimization establish ions residing at surface/subsurface regions have distorted...

Although semiconductor quantum dots are promising materials for displays and lighting due to their tunable emissions, these also suffer from the serious disadvantage of self-absorption emitted light. The reabsorption light is a loss mechanism in practical situations because most phosphors exhibit subunity yields. Manganese-based that high stability efficiency do not this problem but turn lack emission tunability, seriously affecting utility. Here, we present class manganese-doped dot...

Topical observations of colossal permittivity (CP) with low dielectric loss in donor-acceptor cations co-doped rutile TiO2 have opened up several possibilities microelectronics and energy-storage devices. Yet, the precise origin CP behavior, knowledge which is essential to empower device integration suitably, highly disputed literature. From spectromicroscopic approach besides measurements, we explore that microscopic electronic inhomogeneities along nano-scale phase boundaries temperature...

Nanoscale semiconductors show remarkably tunable properties. For metal halide perovskite (MHP) nanocrystals (NCs), surface energy and lattice strain stabilize desirable MHP compositions crystallographic phases that are unstable in the bulk. We report an X-ray scattering study of average room-temperature crystal structure ∼15 nm FAxCs1–xPbI3 (FA = formamidinium) NCs. All crystallize structure; however, lowers symmetry from α (cubic) to β (tetragonal) γ (orthorhombic) with decreasing x (Cs...

We prove that CdS nanocrystals can be thermodynamically stabilized in both wurtzite and zinc-blende crystallographic phases at will, just by the proper choice of capping ligand. As a striking demonstration this, largest (∼15 nm diameter) ever formed with structure have been synthesized high reaction temperature 310 °C, contrast to previous reports suggesting formation only small size limit (<4.5 nm) or lower (≤240 °C). Theoretical analysis establishes binding energy trioctylphosphine...

Several scientific issues concerning the latest generation read heads for magnetic storage devices, based on CoFeB/MgO/CoFeB tunnel junctions (MTJs) are known to be controversial, including such fundamental questions as behavior and role of B in optimizing physical properties these devices. Quantitatively establishing internal structures several devices with different annealing conditions using hard x-ray photoelectron spectroscopy, we resolve controversies establish that diffusion is...

Colloidal halide perovskite nanocrystals (NCs) have the possibility of easy scale-up due to their batch synthesis and demonstrated excellent optoelectronic properties. In particular, NCs remarkably high photoluminescence quantum yields in solution as thin films impressive open circuit voltages photovoltaic devices. Despite these promising results, little work has been done understand stability CsPbI3 for device applications. It previously shown that ligands impart tensile surface strain,...

The trion, a quasiparticle comprising one exciton and an additional charge carrier, offers unique opportunities for generating spin-photon interfaces that can be used in developing quantum networks. Trions are also actively sought after integrated optoelectronic devices including photovoltaics, photodetectors, spintronics. However, formation of trions strongly confined low-dimensional materials is often deemed detrimental. This because trion emission such typically prohibited due to the...

Abstract Long‐lived carrier population and spin‐based behavior in lead halide perovskite nanocrystals (NCs) are extremely interesting for implementing photovoltaic devices with efficiencies exceeding the Shockley–Queisser limit quantum information processing, respectively. However, a comprehensive understanding of polaron‐mediated charge interactions an accurate description spin‐polarized states spintronics still lacking. Herein, spin studied under controlled conditions FAPbI 3 Cs 0.01 FA...