2D layered all-inorganic halide perovskites: recent trends in their structure, synthesis and properties

Acharyya, Paribesh; Kundu, Kaushik; Biswas, Kanishka

doi:10.1039/d0nr06138g

Cited by 52 publications

(35 citation statements)

References 185 publications

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“…Dimensionality of this material is defined by the linkage of the octahedral units [PbX 6 ] 4− forming layers, chains and isolated units for CsPbX 3 and Cs 4 PbX 6 while in case of Cs 2 PbX 5 breaking of corner sharing [PbX 6 ] 4− take place forming [PbX 8 ] 6− . [39] Connectivity of the [PbX 6 ] 4− octahedra is of manifolds, varying from corner‐sharing to face‐sharing to edge‐sharing. If the octahedral units are isolated, it would correspond to 0D, while an arrangement of complete corner sharing octahedral would be a 3D perovskite.…”

Section: Mechanism Of Stokes Shift In Cspbx 3 Systemmentioning

confidence: 99%

Stokes Shift in Inorganic Lead Halide Perovskites: Current Status and Perspective

et al. 2022

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Inorganic metal halide perovskite system is considered as a promising candidate for applications from display to biomedical industry. Intrinsic inorganic lead halides possess small Stokes shift or self‐absorption, providing negative impact for both photo voltaic and biomedical applications. Therefore, the development of an inorganic halide perovskite system with large Stokes shift is a significant venture. This review aims to provide an updated survey of the Stokes shift phenomena in the inorganic lead halide perovskites. The first section focuses about the mechanism, the second section gives different approaches in preparing inorganic perovskites with distinct Stokes shift, while the third section highlights the potential applications in both photovoltaic and biomedical areas. This review provides deep insight about the importance and usefulness of such phenomena in inorganic lead halides, essential for various applications.

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Section: Mechanism Of Stokes Shift In Cspbx 3 Systemmentioning

confidence: 99%

Stokes Shift in Inorganic Lead Halide Perovskites: Current Status and Perspective

et al. 2022

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“…In fact, atomic bonding in most materials is anharmonic with various strengths of anharmonicity 48–55 . Strong anharmonicity causes intrinsic phonon scattering due to Umklapp processes (U‐processes) and determines the intrinsically low κ lat in materials with multidimensional crystal structures 28,29,34,51,56–62 …”

Section: Introductionmentioning

confidence: 99%

Slowing down the heat in thermoelectrics

Qin

Wang

Zhao

2021

InfoMat

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Heat transport has various applications in solid materials. In particular, the thermoelectric technology provides an alternative approach to traditional methods for waste heat recovery and solid‐state refrigeration by enabling direct and reversible conversion between heat and electricity. For enhancing the thermoelectric performance of the materials, attempts must be made to slow down the heat transport by minimizing their thermal conductivity (κ). In this study, a continuously developing heat transport model is reviewed first. Theoretical models for predicting the lattice thermal conductivity (κlat) of materials are summarized, which are significant for the rapid screening of thermoelectric materials with low κlat. Moreover, typical strategies, including the introduction of extrinsic phonon scattering centers with multidimensions and internal physical mechanisms of materials with intrinsically low κlat, for slowing down the heat transport are outlined. Extrinsic defect centers with multidimensions substantially scatter various‐frequency phonons; the intrinsically low κlat in materials with various crystal structures can be attributed to the strong anharmonicity resulting from weak chemical bonding, resonant bonding, low‐lying optical modes, liquid‐like sublattices, off‐center atoms, and complex crystal structures. This review provides an overall understanding of heat transport in thermoelectric materials and proposes effective approaches for slowing down the heat transport to depress κlat for the enhancement of thermoelectric performance.

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“…McCall [98], Copyright 2018 American Chemical Society gaps, respectively. The single crystals of Cs 3 Bi 2 I 9 , Cs 3 Sb 2 I 9 and Rb 3 Sb 2 I 9 displayed weak PL emission in the range of 1.58-2.2 eV with a line width of 315-403 meV, whereas no emission was evidenced for Rb 3 Bi 2 I 9 at room temperature and even at 15 K. The low-temperature PL study revealed several overlapping peaks in the specified range for Cs 3 Bi 2 I 9 at 13 K. Conversely, the PL study of Cs 3 Sb 2 I 9 and Rb 3 Sb 2 I 9 revealed a broad near band-edge emission at 1.92 eV and a broad skewed peak at 1.96 eV, respectively, at 13 K. The phonon-assisted recombination of the self-trapped excitons (STEs) was responsible for the broad emission in these materials [70,100].…”

Section: Optical Absorption and Photoluminescence Propertiesmentioning

confidence: 98%

Two-dimensional halide perovskite single crystals: principles and promises

et al. 2021

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In the last few years, two-dimensional (2D) metal halide perovskites (MHPs) are gaining tremendous attention and are replacing their three-dimensional (3D) congeners rapidly. These next-generation halide perovskites can circumvent the limitations of the 3D MHPs such as stability and structural diversity. The incorporation of bulky organic cation can not only prevent the moisture penetration into the crystal lattice and thus providing greater stability but also expands the field of hybrid semiconducting materials by offering structural diversity. These unique features render even higher tuneability and improved photophysical properties and as a result intensive investigations have been made for 2D MHP-based polycrystalline thin films. However, single crystals based on two-dimensional halide perovskites are still emerging and have great potential for future device applications. Along with the hybrid halide perovskites, the all inorganic halide perovskites are also blossoming. In this review, we have discussed exclusively the development of hybrid as well as all inorganic two-dimensional halide perovskites. First, we have discussed the crystal structure of 2D perovskites. In the next section, different growth procedures reported for preparation of single crystals are discussed. We then highlight the effect of doping on single crystals and their optoelectronic properties. Finally, we discuss the current challenges and future perspectives to further develop 2D single crystals for their efficient use in various devices.

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2D layered all-inorganic halide perovskites: recent trends in their structure, synthesis and properties

Abstract: Recently, halide perovskites have appeared as a superior class of materials for diverse applications, mainly in optoelectronics and photovoltaics. Perovskite halides are broadly classified as hybrid organic-inorganic and all-inorganic analogues...

Cited by 52 publications

References 185 publications

Stokes Shift in Inorganic Lead Halide Perovskites: Current Status and Perspective

Stokes Shift in Inorganic Lead Halide Perovskites: Current Status and Perspective

Slowing down the heat in thermoelectrics

Two-dimensional halide perovskite single crystals: principles and promises

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