Probing molecule-like isolated octahedra via phase stabilization of zero-dimensional cesium lead halide nanocrystals

Arunkumar, Paulraj; Cho, Han Bin; Gil, Kyeong Hun; Unithrattil, Sanjith; Kim, Yoon Hwa

doi:10.1038/s41467-018-07097-x

Cited by 61 publications

(57 citation statements)

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“…For the synthesis of Cs 4 PbX 6 NCs [50,52,54,[132][133][134] and microcrystals, [54] a reverse microemulsion system was developed, which comprised of DMF droplet suspended in a hexane phase due to the immiscible nature of DMF and hexane. Prior to the mixing of different solvents, Cs and Pb precursors (molar ratio 4:1) were thoroughly dissolved in DMF and hexane with the assistance of capping ligands, OA and OAm.…”

Section: Other Methodsmentioning

confidence: 99%

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

et al. 2020

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resistance against thermal-treatment compared to organic-inorganic hybrid lead halide perovskites (MAPbX 3 and FAPbX 3), due to the high thermal decomposition temperature of inorganic cations, thus drawing much attention. Owing to their impressive features, all-inorganic lead halide perovskites have been greatly useful in photovoltaic and optoelectronic applications, including solar cells, light-emitting diodes (LEDs), lasers, photodetectors and photocatalysis. [5-17] The conspicuous achievements in CsPbX 3 provoke the rapid development of its derivatives, Cs 4 PbX 6 and CsPb 2 X 5. These Cs x Pb y X z materials are composed of the same element compositions and [PbX 6 ] 4− unit cells. However, they possess completely different connectivity characters of [PbX 6 ] 4− octahedrons. CsPbX 3 is classified as a type of 3D perovskite, because [PbX 6 ] 4− octahedra are corner-shared along all three axes, while CsPb 2 X 5 has a sandwich-like arrangement with Cs + cations in between PbX 2 crystallographic planes, which can be regarded as a 2D phase. In Cs 4 PbX 6 , disconnected [PbBr 6 ] 4− octahedra are completely decoupled by Cs + cations. Among these three structures, CsPb 2 X 5 and Cs 4 PbX 6 , with dimensional-network less than 3 are referred to as lowdimensional-networked cesium lead halide perovskites. Besides the connectivity, these structures can be understood from a confinement perspective. CsPbX 3 is not confined in any dimension such that it can be considered as a 3D networked semiconductor. CsPb 2 X 5 and Cs 4 PbX 6 are confined in one dimension and all three dimensions, hence the name 2D and 0D structures, respectively. [18,19] In CsPb 2 X 5 and Cs 4 PbX 6 , the excitons cannot dissociate easily within all dimensions; instead, they are confined in the PbX 2 planes and individual [PbX 6 ] 4− units, respectively, resulting in larger bandgaps compared to the traditional ABX 3 phase. Figure 1 illustrates these three structures with different dimensions. Until now, comprehensive accounts of these Cs x Pb y X z materials have been made. However, most recent research focuses on CsPbX 3 , which has excellent optical properties and promising potential in various applications. Its derivatives, CsPb 2 X 5 and Cs 4 PbX 6 have achieved tremendous progress but are still far behind that of CsPbX 3. Many problems still seriously limit the rapid development of these low-dimensional-networked perovskites, a typical one being the debate on the origin of their luminescence. In this Review article, we focus on Cs 4 PbX 6 and CsPb 2 X 5 , and attempt to unveil their features, potential in All-inorganic cesium lead halide perovskites have emerged as promising optoelectronic materials with excellent photophysical properties and great potential in a variety of applications. In parallel with the most investigated CsPbX 3 , its derivates, Cs 4 PbX 6 and CsPb 2 X 5 , with low-dimensional-networked structures have also attracted great attention. In this review, recent advancements on the low-dimensional-networked cesium lead halide perovs...

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Section: Other Methodsmentioning

confidence: 99%

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

et al. 2020

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“…Cs 4 PbBr 6 , a 0D perovskite with isolated [PbBr 6 ] 4− octahedra separated by Cs + ions ( Figure 5a ), has gained broad attention of researchers due to their unprecedented PL QY in solid form, unique crystal structure, and optoelectronic properties. [ 28 , 78 ] However, the PL mechanism of Cs 4 PbBr 6 is highly controversial. In the early 1990s, the anomalous light emission of Cs 4 PbBr 6 was attributed to the inevitable CsPbBr 3 phase during the single‐crystal growth.…”

Section: Properties Of 0d Perovskitesmentioning

confidence: 99%

0D Perovskites: Unique Properties, Synthesis, and Their Applications

et al. 2021

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0D perovskites have gained much attention in recent years due to their fascinating properties derived from their peculiar structure with isolated metal halide octahedra or metal halide clusters. However, the systematic discussion on the crystal and electronic structure of 0D perovskites to further understand their photophysical characteristics and the comprehensive overview of 0D perovskites for their further applications are still lacking. In this review, the unique crystal and electronic structure of 0D perovskites and their diverse properties are comprehensively analyzed, including large bandgaps, high exciton binding energy, and largely Stokes-shifted broadband emissions from self-trapped excitons. Furthermore, the photoluminescence regulation are discussed. Then, the various synthetic methods for 0D perovskite single crystals, nanocrystals, and thin films are comprehensively summarized. Finally, the emerging applications of 0D perovskites to light-emitting diodes, solar cells, detectors, and some others are illustrated, and the outlook on future research in the field is also provided.

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“…On the other hand, halides on the edge layers of 2D Ruddlesden-Popper phases are terminating halides whose coordination number is no longer 2. This non-definitive coordination environ-ment of halides provides the possibility for manipulation of metal halide ''mole-cules,'' 95 or, more specifically, the metal halide [MX 6 ] nionic octahedron units (IOUs) with controllable connectivity and packing geometry (Figure 5A).…”

Section: Possibilities: New Conceptual Framework and Synthetic Design Principlesmentioning

confidence: 99%

The making of a reconfigurable semiconductor with a soft ionic lattice

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Probing molecule-like isolated octahedra via phase stabilization of zero-dimensional cesium lead halide nanocrystals

Cited by 61 publications

References 50 publications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

0D Perovskites: Unique Properties, Synthesis, and Their Applications

The making of a reconfigurable semiconductor with a soft ionic lattice

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