A new formation strategy of hybrid perovskites via room temperature reactive polyiodide melts

Self-healing, where a modification in some parameter is reversed with time without any external intervention, is one of the particularly interesting properties of halide perovskites. While there are a number of studies showing such self-healing in perovskites, they all are carried out on thin films, where the interface between the perovskite and another phase (including the ambient) is often a dominating and interfering factor in the process. Here, self-healing in perovskite (methylammonium, formamidinium, and cesium lead bromide (MAPbBr , FAPbBr , and CsPbBr )) single crystals is reported, using two-photon microscopy to create damage (photobleaching) ≈110 µm inside the crystals and to monitor the recovery of photoluminescence after the damage. Self-healing occurs in all three perovskites with FAPbBr the fastest (≈1 h) and CsPbBr the slowest (tens of hours) to recover. This behavior, different from surface-dominated stability trends, is typical of the bulk and is strongly dependent on the localization of degradation products not far from the site of the damage. The mechanism of self-healing is discussed with the possible participation of polybromide species. It provides a closed chemical cycle and does not necessarily involve defect or ion migration phenomena that are often proposed to explain reversible phenomena in halide perovskites.

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“…As shown before, these then can react again with Pb 0 to close the circle

{ABr}_{3 (normalS - normalL)} + {Pb}_{(s)}^{0} \to {APbBr}_{3 (s)}

…”

mentioning

confidence: 59%

Self‐Healing Inside APbBr₃ Halide Perovskite Crystals

et al. 2018

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“…Tarasov et al developed a novel solvent-free approach to achieve perovskite precursor solution by a reaction of metallic lead with polyiodide melts [100]. The reactive polyiodide melts were obtained by mixing iodine (I 2 ) powder with MAI, as shown in Fig.…”

Section: Other Methodsmentioning

confidence: 99%

Section: Substrate Effectsmentioning

confidence: 99%

Large-area perovskite films for PV applications: A perspective from nucleation and crystallization

Yang

Xue

Чэн

et al. 2021

Journal of Energy Chemistry

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“…Only two families of the perovskites utilize effectively melt preparation techniques—HTSCs and HLHs ( Figure 1 ). In the first case, melt preparation is one of the basic and well-developed approaches ( Table 1 ) while HLH phases have demonstrated such a potential only recently (Petrov et al, 2017a ; Turkevych et al, 2019 ).…”

Section: Morphologies Microstructures and Relevant Processing Technimentioning

confidence: 99%

Perovskite Puzzle for Revolutionary Functional Materials

et al. 2020

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Widely spread crystal lattices of perovskites represent a natural flexible platform for chemical design of various advanced functional materials with unique features. An interplay between chemical bonding, defects and crystallochemical peculiarities makes the perovskite structure a "LEGO designer" utilizing natural features of chemical elements of the renowned Mendeleev's Periodic Table (PTE) celebrating its 150-year anniversary. In this mini-review, crystal chemistry and bonding features, physical and functional properties, preparation methods and tuning functional properties with periodicity "tools" of the PTE will be exemplified for legendary families of high-temperature superconductive cuprates, colossal magnetoresistive manganites and hybrid lead halides for a new generation of solar cells.

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A new formation strategy of hybrid perovskites via room temperature reactive polyiodide melts

Abstract: The new precursors MAI3+x and FAI3+x exhibit exceptionally high reactivity towards lead precursors and result in high quality lead-halide perovskite films.

Cited by 63 publications

References 31 publications

Self‐Healing Inside APbBr₃ Halide Perovskite Crystals

Self‐Healing Inside APbBr₃ Halide Perovskite Crystals

Large-area perovskite films for PV applications: A perspective from nucleation and crystallization

Perovskite Puzzle for Revolutionary Functional Materials

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A new formation strategy of hybrid perovskites via room temperature reactive polyiodide melts

Abstract: The new precursors MAI3+x and FAI3+x exhibit exceptionally high reactivity towards lead precursors and result in high quality lead-halide perovskite films.

Cited by 63 publications

References 31 publications

Self‐Healing Inside APbBr3 Halide Perovskite Crystals

Self‐Healing Inside APbBr3 Halide Perovskite Crystals

Large-area perovskite films for PV applications: A perspective from nucleation and crystallization

Perovskite Puzzle for Revolutionary Functional Materials

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Self‐Healing Inside APbBr₃ Halide Perovskite Crystals

Self‐Healing Inside APbBr₃ Halide Perovskite Crystals