Ligand-assisted thickness tailoring of highly luminescent colloidal CH3NH3PbX3 (X = Br and I) perovskite nanoplatelets

Levchuk, Ievgen; Herre, Patrick; Brandl, Marco; Osvet, Andres; Hock, Rainer; Peukert, Wolfgang; Schweizer, Peter; Spiecker, Erdmann; Batentschuk, Miroslaw; Brabec, Christoph J.

doi:10.1039/c6cc09266g

Cited by 102 publications

(125 citation statements)

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“…We were able to confirm this through theoretical calculations, with further corroboration coming through similar observations obtained by the Tisdale group. [21] The thickness of nanoplatelets obtained in the reprecipitation method can also be controlled by varying the ratio of oleylamine and oleic acid ligands used, reported by Levchuk et al [29] In addition to the bottom-up reprecipitation method, perovskite nanocrystals can also be fabricated in a top-down fashion, as we recently demonstrated in the ligand-assisted transformation of bulk perovskites into nanoplatelets of various compositions and thicknesses by means of ultrasonication. [9] Figure 1c shows the photograph of solutions of colloidal MAPbI 3 nanoplatelets (n = 1,2,3, ≥3 and ∞) illuminated Figure 1.…”

Section: Ligand-guided Synthesismentioning

confidence: 99%

“…[27] Although the growth mechanism of perovskite nanocrystals is not well understood, based on recent studies it is clear that the type and size of ligands used (alkyl amines and acids) play a crucial role in determining the final morphology of nanocrystals obtained. [8,23,[26][27][28][29] For example, the replacement of a long chain acid (oleic acid) with short chain acid (octanoic acid or hexanoic acid) in the synthesis of nanoplatelets can lead to a reduction in dimension form 2D to 1D to obtain quantumconfined ultrathin nanowires (Figure 1f). The thickness of these nanowires could be tuned down to a single monolayer by varying the ratio of short chain to long chain amines.…”

Section: Ligand-guided Synthesismentioning

confidence: 99%

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Advances in Quantum‐Confined Perovskite Nanocrystals for Optoelectronics

Polavarapu

Nickel

Feldmann

et al. 2017

Advanced Energy Materials

198

162

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bivalent cation (Pb 2+ , Sn 2+ or Ge 2+ ) enveloped by an octahedron comprising six halide ions (XCl − , Br − or I − ) with A being a monovalent cation (e.g., CH 3 NH 3 + , NH 2 CHNH 2 + , or Cs + ) residing in between these corner sharing octahedra. [13,14] These components not only dictate the crystal structure, but also control their optical and electronic properties. [2,15] Exemplary is the optical bandgap, which can be tuned throughout the visible range by controlling the halide content. Halide perovskites can form two-dimensional (2D) or quasi-2D layered structures with thickness of one or a few octahedral layers. [16] The reduced thickness of these layers leads to quantum confinement effects, which changes their optical properties significantly in comparison with their three-dimensional (3D) counterparts, as studied since the 80's on thin film perovskites. [17] Recent studies have shown that nanocrystalline perovskites exhibit enhanced PLQYs and offer tunable optical properties not only through their constituent ions but also through their size. [3,[8][9][10][11]15,18,19] Quantum size effects, as illustrated in Figure 1a, have been extensively investigated in conventional semiconductor nanocrystals such as metal chalcogenides and utilized for a wide range of applications during the last two decades. [20] As the size of the nanocrystals approaches the exciton Bohr radius of the material, quantum confinement effects start to influence the excitonic wave function and the energetic states of the exciton, leading to blueshifted photoluminescence (Figure 1a). Precise control of colloidal semiconductor nanocrystal size has enabled the tuning of the PL emission over wide wavelength ranges. Similarly, perovskite nanocrystals of reduced dimensionality exhibit quantum confinement effects, as shown for the case of nanoplatelets in 2015. [8][9][10]21,22] Despite recent advances, an accurate understanding of thickness-and dimensionality-dependent optical properties of perovskite nanocrystals still proves elusive due to difficulties in the controlled syntheses and characterization of their dimensions. Additionally, while many recent publications present perovskite nanocrystals, most of these show negligible or no quantum confinement. [23,24] Here we will provide a concise overview of quantum confinement effects in perovskite nanocrystals, highlighting synthetic methods and resulting properties, characterization methods and finally applications for these enticing nanostructures.Metal halide perovskites have emerged as a promising new class of layered semiconductor material for light-emitting and photovoltaic applications owing to their outstanding optical and optoelectronic properties. In nanocrystalline form, these layered perovskites exhibit extremely high photoluminescence quantum yields (PLQYs) and show quantum confinement effects analogous to conventional semiconductors when their dimensions are reduced to sizes comparable to their respective exciton Bohr radii. The reduction in size leads to strongly blueshifted ...

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Section: Ligand-guided Synthesismentioning

confidence: 99%

Section: Ligand-guided Synthesismentioning

confidence: 99%

Advances in Quantum‐Confined Perovskite Nanocrystals for Optoelectronics

Polavarapu

Nickel

Feldmann

et al. 2017

Advanced Energy Materials

198

162

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“…As for the perovskites with a 2D morphology, Levchuk et al reported the synthesis of CH 3 NH 3 PbX 3 (X = Br, I) nanoplatelets via a ligand-assisted re-precipitation method, tailoring the thickness of nanoplatelets between 1 and 8 unit cell monolayers [64]. Thanks to the quantum confinement effects, the thickness-dependent PL properties of these nanoplatelets would offer an effective method to tune the emission color of perovskites [64].…”

Section: Two-dimensional Materials For Photodetectormentioning

confidence: 99%

“…Thanks to the quantum confinement effects, the thickness-dependent PL properties of these nanoplatelets would offer an effective method to tune the emission color of perovskites [64]. Vapor-phase methods have also been employed for the synthesis of 2D perovskites.…”

Section: Two-dimensional Materials For Photodetectormentioning

confidence: 99%

“…In (BA) 2 (MA) n−1 Pb n I 3n + 1 (n = 1, 2,3,4, ∞) perovskites, the layers are composed of tilted, corner-sharing PbI 6 octahedra, propagating in the ac plane, while the inorganic sheets [63]. (e) AFM characterization of individual CsPbBr 3 nanoplatelets with different colors [64]. (f) An optical image of CH 3 NH 3 PbI 3 nanoplatelets prepared by vapor phase method [48].…”

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confidence: 99%

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Two-Dimensional Halide Perovskites for Emerging New- Generation Photodetectors

Tang¹,

Cao²,

Chi³

2018

Two-Dimensional Materials for Photodetector

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Compared to their conventional three-dimensional (3D) counterparts, two-dimensional (2D) halide perovskites have attracted more interests recently in a variety of areas related to optoelectronics because of their unique structural characteristics and enhanced performances. In general, there are two distinct types of 2D halide perovskites. One represents those perovskites with an intrinsic layered crystal structure (i.e. MX 6 layers, M = metal and X = Cl, Br, I), the other defines the perovskites with a 2D nanostructured morphology such as nanoplatelets and nanosheets. Recent studies have shown that 2D halide perovskites hold promising potential for the development of new-generation photodetectors, mainly arising from their highly efficient photoluminescence and absorbance, color tunability in the visible-light range and relatively high stability. In this chapter, we present the summary and highlights of latest researches on these two types of 2D halide perovskites for developing photodetectors, with an emphasis on synthesis methods, structural characterization, optoelectronic properties, and theoretical analysis and simulations. We also discuss the current challenging issues and future perspective. We hope this chapter would add new elements for understanding halide perovskite-based 2D materials and for developing their more efficient optoelectronic devices.

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Synthesis and Preparation of Perovskite Materials

2023

Perovskite Light Emitting Diodes

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Ligand-assisted thickness tailoring of highly luminescent colloidal CH₃NH₃PbX₃ (X = Br and I) perovskite nanoplatelets

Cited by 102 publications

References 26 publications

Advances in Quantum‐Confined Perovskite Nanocrystals for Optoelectronics

Advances in Quantum‐Confined Perovskite Nanocrystals for Optoelectronics

Two-Dimensional Halide Perovskites for Emerging New- Generation Photodetectors

Synthesis and Preparation of Perovskite Materials

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