Controlled Assembly and Anomalous Thermal Expansion of Ultrathin Cesium Lead Bromide Nanoplatelets

Krajewska, Chantalle J.; Kaplan, A. E.; Kick, Matthias; Berkinsky, David B.; Zhu, Hua; Šverko, Tara; Voorhis, Troy Van; Bawendi, Moungi G.

doi:10.1021/acs.nanolett.2c04526

Cited by 12 publications

(16 citation statements)

References 117 publications

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“…atomic structures and can create differences in binding strength on different facets. [19] Turning to ZwLs, our results show that chelation can overcome the steric effects in quaternary ammonium (Figure 2a, entries 5 and 8), resulting in the growth of anisotropic NCs. This chelation is achieved by replacing Cs and Br atoms with the pair of ZwL charges on the surface, [9c] making the binding sensitive to the local atomic lattices.…”

Section: Structural Effect Of Ligands On Cspbbr 3 Nc Morphologymentioning

confidence: 84%

“…[ 10d ] Previous work suggests that when Cs is replaced by secondary ammonium ligands, which are sterically hindered and have a decreased binding strength, only nanocubes are formed. [ 16 ] Primary ammonium ligands, however, possess multiple paths for hydrogen bonding (i.e., ─NH 3 + ─Br − ) [ 14a,19 ] Their binding strength is sensitive to local atomic structures and can create differences in binding strength on different facets. [ 19 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 16 ] Primary ammonium ligands, however, possess multiple paths for hydrogen bonding (i.e., ─NH 3 + ─Br − ) [ 14a,19 ] Their binding strength is sensitive to local atomic structures and can create differences in binding strength on different facets. [ 19 ]…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Zwitterionic CsPbBr₃ Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs

et al. 2023

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Mechanistic studies of the morphology of lead halide perovskite nanocrystals (LHP‐NCs) are hampered by a lack of generalizable suitable synthetic strategies and ligand systems. Here, the synthesis of zwitterionic CsPbBr3 NCs is presented with controlled anisotropy using a proposed “surface‐selective ligand pairs” strategy. Such a strategy provides a platform to systematically study the binding affinity of capping ligand pairs and the resulting LHP morphologies. By using zwitterionic ligands (ZwL) with varying structures, majority ZwL‐capped LHP NCs with controlled morphology are obtained, including anisotropic nanoplatelets and nanorods, for the first time. Combining experiments with density functional theory calculations, factors that govern the ligand binding on the different surface facets of LHP‐NCs are revealed, including the steric bulkiness of the ligand, the number of binding sites, and the charge distance between binding moieties. This study provides guidance for the further exploration of anisotropic LHP‐NCs.

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Section: Structural Effect Of Ligands On Cspbbr 3 Nc Morphologymentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

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Synthesis of Zwitterionic CsPbBr₃ Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs

et al. 2023

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“…The morphology and structure of CsPbBr 3 NPLs before and after ATDA treatment were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The characterization results from TEM and XRD indicate that surface ligand treatment does not cause the lattice distortion of NPLs. ,, Figure a shows the bright-field TEM image of ATDA-treated NPLs, while the corresponding particle size distribution with an average length size of 18.81 ± 1.22 nm is displayed in Figure d. Figure b corresponds to the bright-field TEM image of the pristine NPLs, and Figure e shows that the length size of the pristine NPLs was determined to be 19.12 ± 1.13 nm.…”

Section: Resultsmentioning

confidence: 99%

Ultrastable Photodetectors Based on Blue CsPbBr₃ Perovskite Nanoplatelets via a Surface Engineering Strategy

Wang,

Du,

Jiang

et al. 2024

ACS Appl. Mater. Interfaces

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Recently, photodetectors based on perovskite nanoplatelets (NPLs) have attracted considerable attention in the visible spectral region owing to their large absorption cross-section, high exciton binding energy, excellent charge transfer properties, and appropriate flexibility. However, their stability and performance are still challenging for perovskite NPL photodetectors. Here, a surface engineering strategy to enhance the optical stability of blue-light CsPbBr 3 NPLs by acetylenedicarboxylic acid (ATDA) treatment has been developed. ATDA has strong binding capacity and a short chain length, which can effectively passivate defects and significantly improve the photoluminescence quantum efficiency, stability, and carrier mobility of NPLs. As a result, ATDA-treated CsPbBr 3 NPLs exhibit improved optical properties in both solutions and films. The NPL solution maintains high PL performance even after being heated at 80 °C for 2 h, and the NPL film remains nondegradable after 4 h of exposure to ultraviolet irradiation. Especially, photodetectors based on the treated CsPbBr 3 NPL films demonstrate exceptional performance, especially when the detectivity approaches up to 9.36 × 10 12 Jones, which can be comparable to the best CsPbBr 3 NPL photodetectors ever reported. More importantly, the assembled devices demonstrated high stability (stored in an air environment for more than 30 days), significantly exceeding that of untreated NPLs.

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“…A particularly useful “building block” for the shape transformation of NCs is a perovskite nanoplatelet (NPL), which can transform into various structures such as nanowires, nanosheets, , nanobelts, nanorods, and nanocubes . In this context, CsPbBr 3 perovskite NPLs are a very appealing system, as they transform over time into extended nanosheets starting from self-assembled structures . This transformation occurs spontaneously and enables structural changes that lead to modifications of optoelectronic properties, evolving from blue-emitting, self-assembled NPLs to green-emitting nanosheets.…”

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confidence: 99%

Real-Time In Situ Observation of CsPbBr₃ Perovskite Nanoplatelets Transforming into Nanosheets

et al. 2023

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The manipulation of nano-objects through heating is an effective strategy for inducing structural modifications and therefore changing the optoelectronic properties of semiconducting materials. Despite its potential, the underlying mechanism of the structural transformations remains elusive, largely due to the challenges associated with their in situ observations. To address these issues, we synthesize temperature-sensitive CsPbBr3 perovskite nanoplatelets and investigate their structural evolution at the nanoscale using in situ heating transmission electron microscopy. We observe the morphological changes that start from the self-assembly of the nanoplatelets into ribbons on a substrate. We identify several paths of merging nanoplates within ribbons that ultimately lead to the formation of nanosheets dispersed randomly on the substrate. These observations are supported by molecular dynamics simulations. We correlate the various paths for merging to the random orientation of the initial ribbons along with the ligand mobility (especially from the edges of the nanoplatelets). This leads to the preferential growth of individual nanosheets and the merging of neighboring ones. These processes enable the creation of structures with tunable emission, ranging from blue to green, all from a single material. Our real-time observations of the transformation of perovskite 2D nanocrystals reveal a route to achieve large-area nanosheets by controlling the initial orientation of the self-assembled objects with potential for large-scale applications.

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Controlled Assembly and Anomalous Thermal Expansion of Ultrathin Cesium Lead Bromide Nanoplatelets

Cited by 12 publications

References 117 publications

Synthesis of Zwitterionic CsPbBr₃ Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs

Synthesis of Zwitterionic CsPbBr₃ Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs

Ultrastable Photodetectors Based on Blue CsPbBr₃ Perovskite Nanoplatelets via a Surface Engineering Strategy

Real-Time In Situ Observation of CsPbBr₃ Perovskite Nanoplatelets Transforming into Nanosheets

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Controlled Assembly and Anomalous Thermal Expansion of Ultrathin Cesium Lead Bromide Nanoplatelets

Cited by 12 publications

References 117 publications

Synthesis of Zwitterionic CsPbBr3 Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs

Synthesis of Zwitterionic CsPbBr3 Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs

Ultrastable Photodetectors Based on Blue CsPbBr3 Perovskite Nanoplatelets via a Surface Engineering Strategy

Real-Time In Situ Observation of CsPbBr3 Perovskite Nanoplatelets Transforming into Nanosheets

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Synthesis of Zwitterionic CsPbBr₃ Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs

Synthesis of Zwitterionic CsPbBr₃ Nanocrystals with Controlled Anisotropy using Surface‐Selective Ligand Pairs

Ultrastable Photodetectors Based on Blue CsPbBr₃ Perovskite Nanoplatelets via a Surface Engineering Strategy

Real-Time In Situ Observation of CsPbBr₃ Perovskite Nanoplatelets Transforming into Nanosheets