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...

Self-healing, where a modification in some parameter is reversed with time without any external intervention, one of the particularly interesting properties halide perovskites. While there are number studies showing such self-healing perovskites, they all carried out on thin films, interface between perovskite and another phase (including ambient) often dominating interfering factor process. Here, (methylammonium, formamidinium, cesium lead bromide (MAPbBr3 , FAPbBr3 CsPbBr3 )) single...

In this work, a soft‐lithographic approach to fabricate submicrometer metal organic framework (MOF)‐based 2D photonic structures is described. Nanometric zeolitic imidazole material ZIF‐8 (zinc) chosen as the sensible MOF because of its chemical stability and vapor selective adsorption properties. Two different systems are fabricated: nanopatterned colloidal homo‐ ZIF‐8/TiO 2 heterostructures. Several features (stripes, squares, etc.) with dimensions 200 nm replicated on substrates such...

A new, simple bi-phasic dip-coating method is developed. This considered as a great improvement of the technique for research, development and production, since expensive, rare, harmful, or time-evolving solutions can now be easily deposited on large surfaces single side from very little amounts solution. As service to our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may re-organized online delivery, but not copy-edited...

Capillary phenomena governing the mass-transport (capillary filling, condensation/evaporation) has been experimentally investigated in around 20 different silica thin films exhibiting various porosities with pores dimension ranging from 2 to 200 nm.

Ion diffusion affects the optoelectronic properties of halide-perovskites (HaPs). Until now, fastest has been attributed to movement halides, largely neglecting contribution protons, on basis computed density estimates. Here, process proton inside HaPs, following deuterium-hydrogen exchange and migration in MAPbI3 , MAPbBr3 FAPbBr3 single crystals, is proven through D/H NMR quantification, Raman spectroscopy, elastic recoil detection analysis, challenging original assumption halide-dominated...

The fine equilibrium between photodamage and self-healing determines the defect density in halide perovskites. Here we analyze chemistry of processes on surface bulk APbBr3 single crystals. (A = MA, FA, Cs).

Abstract The extensive use of perovskites as light absorbers calls for a deeper understanding the interaction these materials with light. Here, evolution chemical and optoelectronic properties formamidinium lead tri‐bromide (FAPbBr 3 ) films is tracked under soft X‐ray beam high‐brilliance synchrotron source by photoemission spectroscopy micro‐photoluminescence. Two contrasting processes are at play during irradiation. degradation material manifests formation Pb 0 metallic clusters, loss...

In this work, unique functional devices exhibiting controlled gradients of properties are fabricated by dip-coating process in acceleration mode. Through new approach, thin films with "on-demand" thickness graded profiles at the submillimeter scale prepared an easy and versatile way, compatible for large-scale production. The technique is adapted to several relevant materials, including sol-gel dense mesoporous metal oxides, block copolymers, metal-organic framework colloids, commercial...

Abstract The interaction of free carriers with defects and some critical defect properties are still unclear in methylammonium lead halide perovskites (MHPs). Here, a multi‐method approach is used to quantify characterize single crystal MAPbI 3 , giving cross‐checked overview their properties. Time flight current waveform spectroscopy reveals the five shallow deep defects. Photo‐Hall thermoelectric effect assess density, cross‐section, relative (to valence band) energy. detailed...

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...

The future of halide perovskites (HaPs) is beclouded by limited understanding their long-term stability. While HaPs can be altered radiation that induces multiple processes, they also return to original state "self-healing." Here two-photon (2P) absorption used effect light-induced modifications within MAPbI3 single crystals. Then the changes in photodamaged region are followed measuring photoluminescence, from 2P with 2.5 orders magnitude lower intensity than for photodamaging . After...

Abstract Coupling electromagnetic radiation with matter, e.g., by resonant light fields in external optical cavities, is highly promising for tailoring the optoelectronic properties of functional materials on nanoscale. Here, we demonstrate that even internal induced coherent lattice motions can be used to control transient excitonic response CsPbBr 3 halide perovskite crystals. Upon photoexcitation, two-dimensional electronic spectroscopy reveals an peak structure oscillating persistently a...

In terms of sustainable use, halide perovskite (HaP) semiconductors have a strong advantage over most other classes materials for (opto)electronics, as they can self-heal (SH) from photodamage. While there is considerable literature on SH in devices, where it may not be clear exactly damage and occur, much less the HaP material itself. Here we perform "fluorescence recovery after photobleaching" (FRAP) measurements to study polycrystalline thin films which encapsulation critical achieving...

Abstract Self‐adaptation and homeostasis are features that distinguish living systems from artificial materials. Living systems, such as plants or the human eye, integrate positive negative feedback mechanisms to autonomously manage their thermal, optical, chemical responses changing sunlight conditions. However, replicating sophisticated behavior in devices presents a significant challenge. Herein, an inorganic homeostatic device is proposed integrates both for adaptive regulation of...

<title>Abstract</title> Metal-Organic Frameworks (MOFs) offer remarkable chemical versatility, structural diversity, and, in some cases, stimuli-responsiveness. In the latter case, they typically rely on external inputs to trigger these changes. contrast, living systems possess ability internally self-regulate and autonomously adapt their properties without intervention, utilizing internal feedback mechanisms. To address this challenge, we develop a MOF-based metasurface that exhibits...

Abstract Adding a 2D character to halide perovskite (HaP) active layers in ambient‐protected cells can improve their stability drastically, which is not obvious from the hydrophobicity of large cations that force HaP into structure. Results two‐photon confocal microscopy are reported study inherent photo‐stability Pb iodide HaPs interior single crystals. Compared 3D crystals, ones have higher and, under few sun‐equivalent conditions, self‐heal efficiently after photo‐damage. Using both...

Triple cation, mixed halide perovskite compositions have been reported to be more thermally stable, exhibit fewer phase impurities, and show higher power conversion efficiency better reproducibility than single cation perovskites. In this work, we explain the formation of Cs0.05FA0.81MA0.14Pb(I0.85Br0.15)3 via a multimodal in situ study combining structural information from synchrotron grazing-incidence wide-angle X-ray scattering (GIWAXS) optical properties photoluminescence (PL)...

Time-resolved, pulsed excitation methods are widely used to deduce optoelectronic properties of semiconductors, including now also Halide Perovskites (HaPs), especially transport properties. Howev-er, as yet no evaluation their amenability and justification for the use results above-noted purposes has been reported. To check if we can learn from measurement about steady-state phototransport properties, show here that, although measurements be useful extract information on recombination...

Halide perovskites solar cells (PSCs) are making true on past promises, having reached power conversion efficiencies (PCEs) of 25.7% and long lifespans (>3000 h). Although stability has become the focus research efforts, a significant number researchers still dedicated to further increasing cell efficiency. To push PCE any higher however, every element must be controlled optimized. In context recent advancements in halide perovskite doping, we analyse how why doping can modify PSCs. We find...

In this work, we report the condensation and stabilization of water vapors into water-repellent, methyl-functionalized, mesoporous, silica-based films at room temperature atmospheric pressure using a soft alcohol-assisted method. The capillary pore fillings due to adsorption were ensured by fine control partial vapor pressures alcohol water. A synergic coadsorption was observed reversible surface energy switching from hydrophobic hydrophilic induced preferential interaction alkyl side...

Red blood cells (RBCs) loaded with iron oxide nanoparticles have been proposed as biomimetic constructs long half‐life (ca. 20 days) in the compartment and potentially interesting properties (such relaxivity) intravascular contrast agents for magnetic resonance imaging. However, encapsulation of into RBCs might affect their relaxivity, which may be significantly different from native suspension. Here, we present a relaxometric study P904, novel ultra small nanoparticle developed by Guerbet,...

Abstract Humidity is often reported to compromise the stability of lead halide perovskites or devices based on them. Here we measure humidity dependence elastic modulus and hardness for two series perovskite single crystals, varying either by cation anion type. The results reveal a bond length between, hydrogen bonding with, polarizability/polarization these ions. show an intriguing inverse relation between hardness, in contrast their positive correlation most other materials. This anomaly...

Abstract Self‐healing (SH) of (opto)electronic material damage can have a huge impact on resource sustainability. The rising interest in halide perovskite (HaP) compounds over the past decade is due to their excellent semiconducting properties for crystals and films, even if made by low‐temperature solution‐based processing. Direct proof self‐healing Pb‐based HaPs demonstrated through photoluminescence recovery from photodamage, fracture healing use as high‐energy radiation particle...