Two-dimensional halide perovskite nanomaterials and heterostructures

Shi, Enzheng; Gao, Yao; Finkenauer, Blake P.; Akriti,; Coffey, Aidan H.; Dou, Letian

doi:10.1039/c7cs00886d

Cited by 371 publications

(324 citation statements)

References 190 publications

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“…As compared to mechanical exfoliation and chemical vapor deposition techniques, solution-processing approach was more effective to achieve high-quality crystals [93]. For instance, L. Dou et al synthesized blue emitting 2D sheets with an unusual structural relaxation and photoluminescence shift [8].…”

Section: D and Quasi-2d Metal Halide Hybridsmentioning

confidence: 99%

Organic–inorganic metal halide hybrids beyond perovskites

Zhou

Lin

Lee

et al. 2018

Materials Research Letters

104

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Organic-inorganic metal halide hybrids have emerged as new generation functional materials with exceptional structure and property tunability for a variety of applications. Besides the most investigated ABX 3 metal halide perovskites, a variety of hybrids consisting of a wide range of organic cations and metal halide anions have been developed and studied recently. Here, we provide an overview of these new materials possessing various crystallographic structures, including double perovskites, low dimensional hybrids, and other perovskite-related materials. We discuss their syntheses, functional properties, and optoelectronic applications. Challenges and opportunities are then laid out for these hybrid materials beyond perovskites. IMPACT STATEMENTBy choosing appropriate organic cations and metal halide anions, single crystalline ionically bonded hybrid materials can be assembled to possess various structures beyond the well-known ABX 3 perovskite. These hybrid materials exhibit exciting new properties with potential applications in a variety of areas. ARTICLE HISTORY

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Section: D and Quasi-2d Metal Halide Hybridsmentioning

confidence: 99%

Organic–inorganic metal halide hybrids beyond perovskites

Zhou

Lin

Lee

et al. 2018

Materials Research Letters

104

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“…a2) Typical TEM image of CsPbBr 3 nanocrystal (NC). [22] Analysis of the optoelectronic properties of the abovementioned perovskites at different dimensions and varying chemical compositions is necessary to determine their target applications. [19] Copyright 2019, American Chemical Society.…”

Section: Basic Structure and Chemistrymentioning

confidence: 99%

“…Scale bar, 10 lm. [22,23,28] With increasing layer thickness (n > 2), there is room for direct exciton dissociation pathway via the so-called "edge states" in 2D perovskites, which leads to more extracted free charges and higher device performance. [21] Copyright 2019, Science.…”

Section: Basic Structure and Chemistrymentioning

confidence: 99%

“…[21,22,[32][33][34] Here, we make the distinction that the dimensions stated above do not strictly refer to the perovskite crystal dimensions itself but rather to nanostructured morphological dimensions. [21,22,[32][33][34] Here, we make the distinction that the dimensions stated above do not strictly refer to the perovskite crystal dimensions itself but rather to nanostructured morphological dimensions.…”

Section: Basic Structure and Chemistrymentioning

confidence: 99%

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Perovskites for Laser and Detector Applications

Das

Gholipour

Saliba

2019

Energy & Environ Materials

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Formally, perovskites have an ABX 3 structure where the A-site ion occupies a central cavity enclosed by corner shared octahedral BX 6 moieties forming a cubic crystal structure. Because of the formal stoichiometry requirement, that is, q A + q B = 3q X (q X is the charge of ion X), only certain elements are allowed to act as the X-site ion in the perovskites crystal structure. [1] Usually, the most common are the oxides with X = O (e.g., CaTiO 3 , SrTiO 3 , and KTaO 3 ) or the halides with X = F, Cl, Br, or I. To fit into an ideal cubic perovskite, the A-site cation has to be larger than B-site and thus specific size conditions need to be satisfied. This size requirement, as well as structural stability, is captured by the so-called Goldschmidt's tolerance factor (GTF) (t ¼ rAþrX ffiffi 2 p ðrBþrXÞ ) [2] along with the octahedral factor (l ¼ rB rX ), [3] where r X simply refers to the radius of the ion X. For an ideal cubic crystal structure, as in many 3D halide perovskites, the conditions 0.8 ≤ t ≤1 and 0.44 ≤ µ ≤ 0.90 need to be satisfied. For an ideal 3D perovskite structure, a t-value of 1 is desired and within the allowed range between 0.8 and 1, tilting of the BX 6 octahedra is noted , leading to a quasi-ideal perovskite structure. Contrarily, t-values larger than 1 or lower than 0.8 lead to formation of hexagonal and non-cubic structures, respectively. [4,5] This model determining geometry, shape, and size of crystal motifs is particularly applicable for fluorides and oxides because of their high electronegativities making the nature of their bonding increasingly ionic. [6] However, deviation from tolerance factor has been observed for many metal-organic framework-based perovskites (e.g., ABX 3 formats) [7] or ammonium halide perovskites with A-cation larger than methyl or formamidinium. [7,8] The pertinent reason in such cases is that r X cannot be clearly defined for the covalently bonded organic moieties in the perovskite framework. The tolerance factors have been thus revised using Kieslich model of effective ionic radii, [7] and molecular globularity model by Gholipour et al. [8] The ammonium halide-based hybrid perovskites mentioned above dispose into tunable structures, phases, dimensionalities, and morphologies (see Figure 1). Generally, a perovskite unit cells can multiply forming double perovskites like Ba 2 CaTeO 6 and Sr 2 FeMoO 6[9] or triple perovskites, [10] for example, Ba 2 KNaTe 2 O 9 or anti-perovskites [11] (see Panel A, Figure 1). In addition, perovskites can dispose into layered phases constituting 2D BX 6 octahedra with interspersed cations forming the so-called Ruddlesden-Popper, [12] Aurivillius, [13] and Dion-Jacobson phases [14] (see Panel A, Figure 1). For a structural configuration (RNH 3 ) 2 A n À 1 B n X 3n + 1 where R is an organic group, the perovskite dimensionalities are dictated by integer values of n which represents the number of inorganic layers enveloped by organic cations. [5,15] An nvalue of 1 yields pure 2D perovskites, and n-value of 1 gives 3D perovskites wh...

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“…The memory device with a structure of Al/2H-MoS 2 -PVP/ITO/PET exhibited bipolar resistive switching memory ( Figure 4c). [116] Moreover, the heterojunction structure could be applied in memory applications that offer novel functionality as photon recording. Moreover, mixed phase (2H and 1T) hybrid materials which possess semiconducting and metallic region, the Al/1T@2H-MoS 2 -PVP/ITO/PET showed WORM memory effect due to the internal electric field which protects the trapped electrons from being detrapped.…”

Section: Tmd-related Composites and Heterojunction-based Memorymentioning

confidence: 99%

Recent Advances in Memory Devices with Hybrid Materials

Hwang

Lee

2018

Adv Elect Materials

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Increasing demands for information‐storage capacity and for miniaturization of memory cells have driven exploration of new‐generation data storage devices, because the conventional Si‐based memory technology is approaching its fundamental physical limits. Hybrid materials and novel device structure may lead to a paradigm shift toward memory devices that have high density, multifunctionality, and low power consumption. Here, the structure and operation mechanism of resistive switching memory devices are described, then recent advances in hybrid materials (e.g., graphene‐based polymer composites, organic–inorganic hybrid perovskite materials) for fabrication of these devices are summarized. How to increase the ON/OFF ratio and the density of memories, and to decrease programming voltage by selecting appropriate active materials, and engineering the active layers, are also demonstrated. Finally, the current challenges and future directions in memory devices based on hybrid materials are summarized.

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Two-dimensional halide perovskite nanomaterials and heterostructures

Cited by 371 publications

References 190 publications

Organic–inorganic metal halide hybrids beyond perovskites

Organic–inorganic metal halide hybrids beyond perovskites

Perovskites for Laser and Detector Applications

Recent Advances in Memory Devices with Hybrid Materials

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