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PubMed Journals Articles About "Observation Vortex Domains Dimensional Lead Iodide Perovskite Ferroelectric" RSS

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Showing "Observation vortex domains dimensional lead iodide perovskite ferroelectric" PubMed Articles 1–25 of 12,000+

Observation of vortex domains in a two-dimensional lead iodide perovskite ferroelectric.

Topological defects, such as vortices and skyrmions, provide a wealth of splendid possibilities to new nanoscale devices because of their marvelous electronic, magnetic, and mechanical behaviors. Recently, great advances have been made in the study of ferroelectric vortex in conventional perovskite oxides, such as BaTiO3, and BiFeO3. Despite extensive interest, however, no intriguing ferroelectric vortex structures have yet been found in organic-inorganic hybrid perovskites (OIHPs), which are desirable for ...


Guanine-Stabilized Formamidinium Lead Iodide Perovskites.

Formamidinium (FA) lead iodide perovskite materials feature promising photovoltaic performances in conjunction with superior thermal stabilities. However, the conversion of the perovskite α-FAPbI 3  phase to the thermodynamically stable yet photovoltaically inactive δ-FAPbI3 phase compromises the photovoltaic performances of the corresponding solar cells. Herein, we demonstrate a novel strategy for overcoming this challenge by employing low-dimensional hybrid perovskite materials comprising guaninium (G)...

A Three-dimensional M3AB-type Hybrid Organic-inorganic Antiperovskite Ferroelectric: C3H7FN3SnCl6Cl.

Since the first perovskite CaTiO3 was discovered in 1839s, the development of perovskite has a history of 180 years. The emergence of solar cells-(CH3NH3)PbI3 has set off the trend of hybrid organic-inorganic perovskite (HOIP) materials. Since then, various HOIPs have sprung up and been widely used in various material devices. Among them, HOIP ferroelectrics have gained widespread attention. However, antiperovskite, as a twin brother of perovskite, has been neglected although it has similar structure with p...


Mechanical writing of in-plane ferroelectric vortices by tip-force and their coupled chirality.

Recent experiments have demonstrated the existence of vortex or flux-closure domains in ferroelectric nanostructures, which are attractive to develop high-density data storage and novel configurable electronic devices. However, it remains challenging to stabilize in-plane vortex or flux-closure domains in ferroelectric film for the absence of a lateral geometry confinement. Based on a three-dimensional phase field model, here we show that stabilization of isolated or interacting in-plane vortices in ferroel...

The First Halide Double Perovskite Ferroelectric.

Halide double perovskites have recently emerged as a promising environmentally friendly optoelectronic and photovoltaic material for their inherent thermodynamic stability, high defect tolerance, and appropriate bandgaps. However, up to now, no ferroelectric material based on halide double perovskites has been discovered. Herein, by the mean of hetero-substitution of lead and cation-intercalation of n -propylamine, we design the first halide double perovskite ferroelectric of ( n -propylammonium) 2 CsAgBiBr...

Efficient Two-Dimensional Tin Halide Perovskite Light-Emitting Diodes via a Spacer Cation Substitution Strategy.

Lead halide perovskites have attracted tremendous attention due to their impressive optoelectronic properties. However, the toxicity of lead remains to be a bottleneck for further commercial development. Two-dimensional Ruddlesden-Popper tin-based perovskites are lead-free and more stable compared to their 3D counterparts, which have great potential in the optoelectronic device field. Herein, we demonstrated high-quality 2D phenylethyl ammonium tin-iodide perovskite (PEA2SnI4) thin films by dropping toluene...

A Potential Sn-Based Hybrid Perovskite Ferroelectric Semiconductor.

Ferroelectric semiconductors, combining semiconduction, spontaneous polarization, and photo-induced excitation, show great promise to enhance the performance of solar cells, pressure sensors, and photodetectors. Particularly, organic-inorganic lead-halide perovskite ferroelectrics have been explored for their prominent carrier transport properties and instinct structural tunability. Whereas, high concentration of toxic Pb is the potential stumbling block for their further application. Here, we present a lea...

Trilayered Lead-Chloride Perovskite Ferroelectric Affording Self-Powered Visible-Blind Ultraviolet Photodetection with Giant Zero-Bias Photocurrent.

Perovskite ferroelectrics, in which the spontaneous polarization (Ps) is conducive to the separation of photoexcited charge carriers, have shown great potential for self-powered photodetection. Nevertheless, such self-powered ferroelectric photodetectors are mostly dominated by traditional inorganic oxides and exhibit relatively small zero-bias photocurrent, which limit their further application. Herein, we present a wide bandgap 2D trilayered lead-chloride hybrid perovskite ferroelectric, EA4Pb3Cl10 (1, EA...

Two-dimensional layered perovskite ferroelectric with giant piezoelectric voltage coefficient.

Piezoelectric sensors that can work in various conditions with superior performance are highly desirable with the arrival of the Internet of Things. For practical applications, large piezoelectric voltage coefficient g and high Curie temperature Tc are critical to the performance of piezoelectric sensors. Here, we report a two-dimensional perovskite ferroelectric (4-aminotetrahydropyran)2PbBr4 [(ATHP)2PbBr4] with a saturated polarization of 5.6 μC cm-2, high Tc of 503 K [above that of BaTiO3 (BTO, 393 K)],...

Green Emitting Lead-Free Cs4SnBr6 Zero-Dimensional Perovskite Nanocrystals with Improved Air Stability.

It is reported the synthesis and characterization of nanocrystals of a novel fully inorganic lead-free zero-dimensional perovskite, namely Cs4SnBr6. Samples are made of crystal with average size around 20 nm with green emission centered around 530 nm. Interestingly, both colloidal suspensions and thin films show and enhanced air-stability with respect to any other previous tin-based nanocrystalline system, with emission persisting for tents of hours under laboratory air.

The degradation mechanism of silver metal deposited on lead halide perovskites.

Lead halide perovskite solar cells have significantly increased in both efficiency and stability over the last decade. An important aspect for their long-term stability are the reactions between the perovskite and other materials in the solar cell. This includes the contact materials and their degradation if they can potentially come into contact through e.g. pinholes or material diffusion and migration. Here, we explore the interactions of silver contacts with lead halide perovskites of different compositi...

Molecular Engineering of Pure 2D Lead-Iodide Perovskite Solar Absorbers Displaying Reduced Band Gaps and Dielectric Confinement.

Pure 2D lead-iodide perovskites typically demonstrate poor charge transport and compromised visible light absorption, relative to their 3D congeners. This hinders their potential use as solar absorbers. Herein, we report systematic tuning of pyridinium-based templating cations to introduce intermolecular interactions that provide access to a series of new 2D lead-iodide perovskites with reduced inter-octahedral distortions (largest Pb-( μ -I)-Pb bond angles of 170 - 179°) and very short inorganic interlay...

Voltage-driven annihilation and creation of magnetic vortices in Ni discs.

Using photoemission electron microscopy (PEEM) to image ferromagnetism in polycrystalline Ni disks, and ferroelectricity in their single-crystal BaTiO3 substrates, we find that voltage-driven 90° ferroelectric domain switching serves to reversibly annihilate each magnetic vortex via uniaxial compressive strain, and that the orientation of the resulting bi-domain reveals the chirality of the annihilated vortex. Micromagnetic simulations reveal that only 60% of this strain is required for annihilation. Volta...

FA-Assistant Iodide Coordination in Organic-Inorganic Wide-Bandgap Perovskite with Mixed Halides.

Mixed-halide wide-bandgap perovskites are key components for the development of high-efficiency tandem structured devices. However, mixed-halide perovskites usually suffer from phase-impurity and high defect density issues, where the causes are still unclear. By using in situ photoluminescence (PL) spectroscopy, it is found that in methylammonium (MA )-based mixed-halide perovskites, MAPb(I Br ) , the halide composition of the spin-coated perovskite films is preferentially dominated by the bromide ions (Br ...

High-Energy Photon Spectroscopy Using All Solution-Processed Heterojunctioned Surface-Modified Perovskite Single Crystals.

Organic-inorganic hybrid perovskites have been intensively studied for their use in optoelectronic devices due to their utilization of low-cost, earth-abundant precursors that are solution-processed at low-temperatures into high-quality devices. Despite this progress, interdevice variability and long-term stability have prevented the widespread commercial adoption of perovskite devices, especially for high-energy photon detectors. Using methylammonium lead iodide perovskite single crystals grown via inverse...

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications.

We demonstrate a tunable longwave infrared photodetector with ultra-high sensitivity based on graphene surface plasmon polaritons controlled by ferroelectric domains. The simulated results show that the photodetector shows a tunable absorption peak, modulated by periodically polarized ferroelectric domains at the nanoscale, with an ultra-high responsivity up to 7.62 × 106 A W-1 and a detectivity of ∼6.24 × 1013 Jones (Jones = cm Hz1/2 W-1) in the wavelengths ranging from 5 to 20 μm at room temperature....

Tuning methylammonium iodide amount in organolead halide perovskite materials by post-treatment for high-efficiency solar cells.

In this study, the composition of organic-inorganic perovskite materials is tuned by methylammonium iodide (MAI) post-treatment for high photovoltaic performance. By spin-coating MAI solutions of different concentrations, the amounts of PbI2 and MAI in perovskite layers are tuned. In perovskites, the removal of PbI2 through a reaction with MAI decreases the hysteresis in photocurrent density-voltage curves. Further, by treating perovskites with a high-concentration MAI solution, the excess MAI is incorporat...

Ferroelectric and dipole control of band alignment in the two dimensional InTe/In2Se3 heterostructure.

Two dimensional (2D) ferroelectric materials are gaining growing attention due to their nontrival ferroelectricity, and the 2D ferroelectric heterostructures with tunable electronic, optoelectronic, or even magnetic properties, show many novel properties that do not exist in their constituents. In this work, by using the first-principles calculations, we investigate the ferroelectric and dipole control of electronic structures of the 2D ferroelectric heterostructure InTe/In$_{2}$Se$_{3}$. It is found that b...

Memristor with a ferroelectric HfO2 layer: In which case it is a ferroelectric tunnel junction.

New interest in the implementation of ferroelectric tunnel junctions has emerged following the discovery of ferroelectric properties in HfOfilms, which are fully compatible with silicon microelectronics technology. The coercive electric field to switch polarization direction in ferroelectric HfOis relatively high compared to classical perovskite materials, and thus it can cause the migration of non-ferroelectric charges in HfO, namely charged oxygen vacancies. The charge redistribution would cause the chang...

Efficient Bifacial Passivation with Crosslinked Thioctic Acid for High-Performance Methylammonium Lead Iodide Perovskite Solar Cells.

Defects, inevitably produced within bulk and at perovskite-transport layer interfaces (PTLIs), are detrimental to power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). It is demonstrated that a crosslinkable organic small molecule thioctic acid (TA), which can simultaneously be chemically anchored to the surface of TiO and methylammonium lead iodide (MAPbI ) through coordination effects and then in situ crosslinked to form a robust continuous polymer (Poly(TA)) network after ther...

Recent Developments in Lead-Free Double Perovskite: Structure, Doping, and Applications.

Lead-free perovskite structures have been recently attracting considerable attention because of their eco-friendly nature and properties, such as their lead-based structure. In this work, we reviewed the lead-free double perovskite (LFDP) structure because of its unique electronic dimensions, chemical stability, and substitutional chemistry compared with other lead-free structures. We highlighted the recent progress on crystal structure prediction, synthesis methods, metal dopants, and ligand passivation on...

Roadmap on halide perovskite and related devices
.

Since the first report on solid-state perovskite solar cell (PSC) with ~10% power conversion efficiency (PCE) and 500 h-stability in 2012, tremendous efforts have been being devoted to develop PSCs with higher PCE, longer stability and recycling hazardous lead waste. As a result, PCE over 23% was recorded in 2018 and stability over 10,000 h was reported. Beyond photovoltaics, lead halide perovskite materials demonstrated superb properties when they were applied to flat-panel X-ray detector and non-volatile ...

In Situ Observation of Vapor-Assisted 2D-3D Heterostructure Formation for Stable and Efficient Perovskite Solar Cells.

The heterogeneous stacking of a thin two-dimensional (2D) perovskite layer over the three-dimensional (3D) perovskite film creates a sophisticated architecture for perovskite solar cells (PSCs). It combines the remarkable thermal and environmental stabilities of 2D perovskites with the superior optoelectronic properties of 3D materials, which resolves the chronic stability issue with no compromise on efficiency. Herein, we propose the vapor-assisted growth strategy to fabricate high-quality 2D/3D heterostru...

Two-dimensional Organic-Inorganic Perovskite Ferroelectric Semiconductor with the Fluorinated Aromatic Spacers.

Two-dimensional (2D) organic-inorganic perovskites (OIPs), with improved material stability over the 3D counterparts, are highly desirable for device applications. It is their considerable structural diversity that offers an unprecedented opportunity to engineer materials with fine-tuning functionalities. The isosteric substitution of hydrogen by an electronegative fluorine atom has been proposed as a useful route to improve the photovoltaic performance of 2D OIPs, whereas its valuable role in developing fe...

Correlating Hysteresis and Stability with Organic Cation Composition in the Two-Step Solution-Processed Perovskite Solar Cells.

The two-step solution-based process has demonstrated substantial success in fabricating high-efficiency perovskite solar cells in recent years. Despite the high performance, the underlying mechanisms that govern the formation of perovskite films and corresponding device performance are yet to be fully understood. Particularly, organic cation composition used in the two-step solution processing of mixed-cation lead halide perovskite solar cells plays a critical role in the perovskite film formation and the r...


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