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Self-Assembly of Quantum-Confined CsPbBr3 Perovskite Nanocrystals into Rhombic, Frame, and Rectangular Superlattices

Gomes Ferreira, Matheus LU orcid ; Gastin, Baptiste ; Hiller, Jonas ; A. Zaluzhnyy, Ivan ; N. Hinsley, Gerard ; Wang, Bihan ; Hoon Ngoi, Kuan ; A. Vartanyants, Ivan ; Schreiber, Frank and Scheele, Marcus , et al. (2025) In Small Structures
Abstract
Superlattices of quantum-confined perovskite nanocrystals (5–6 nm) present an interesting example of colloidal crystals because of the interplay between nanoscopic parameters (nanocrystal sizes, shapes, and colloidal softness) and the microscopic shapes of their assemblies. These superlattices are reported as rectangular or rhombic, with little discussion of the outcomes of self-assembly experiments which are worthwhile to study given the rising interest in the optical properties of these nanomaterials. It is observed that various superlattice shapes are produced in a single solvent evaporation experiment from a nanocrystal dispersion drop-casted onto a tilted substrate. The observed shapes are categorized as rhombi, rectangles, and hollow... (More)
Superlattices of quantum-confined perovskite nanocrystals (5–6 nm) present an interesting example of colloidal crystals because of the interplay between nanoscopic parameters (nanocrystal sizes, shapes, and colloidal softness) and the microscopic shapes of their assemblies. These superlattices are reported as rectangular or rhombic, with little discussion of the outcomes of self-assembly experiments which are worthwhile to study given the rising interest in the optical properties of these nanomaterials. It is observed that various superlattice shapes are produced in a single solvent evaporation experiment from a nanocrystal dispersion drop-casted onto a tilted substrate. The observed shapes are categorized as rhombi, rectangles, and hollow frames (including hollow rectangular frames, nested structures, and interconnected fragments). The influence of self-assembly conditions is studied by optical microscopy, and the nanocrystal circularity, aspect ratio, and size are quantified by transmission electron microscopy with additional insights into the superlattice structure provided by X-ray nanodiffraction. The results suggest that rhombic shapes arise from a subpopulation of nanocrystals with broader size and shape dispersions, whereas more uniform nanocrystals form rectangular structures (either solid or hollow). The solvent evaporation dynamics and diffusion of the drying liquid contribute to forming more complex shapes, such as nested frames and cracked and multidomain superlattices. (Less)
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organization
publishing date
type
Contribution to journal
publication status
epub
subject
in
Small Structures
article number
2500133
pages
11 pages
publisher
Wiley
external identifiers
  • scopus:105004700063
ISSN
2688-4062
DOI
10.1002/sstr.202500133
project
Engineering of Superfluorescent Nanocrystal Solids
Tennbaserade nanostrukturer för optisk kvantteknologi
language
English
LU publication?
yes
id
78c36e01-7537-419e-be0d-03b7644012a6
alternative location
https://onlinelibrary.wiley.com/doi/10.1002/sstr.202500133
date added to LUP
2025-05-13 22:31:24
date last changed
2025-05-24 04:03:12
@article{78c36e01-7537-419e-be0d-03b7644012a6,
  abstract     = {{Superlattices of quantum-confined perovskite nanocrystals (5–6 nm) present an interesting example of colloidal crystals because of the interplay between nanoscopic parameters (nanocrystal sizes, shapes, and colloidal softness) and the microscopic shapes of their assemblies. These superlattices are reported as rectangular or rhombic, with little discussion of the outcomes of self-assembly experiments which are worthwhile to study given the rising interest in the optical properties of these nanomaterials. It is observed that various superlattice shapes are produced in a single solvent evaporation experiment from a nanocrystal dispersion drop-casted onto a tilted substrate. The observed shapes are categorized as rhombi, rectangles, and hollow frames (including hollow rectangular frames, nested structures, and interconnected fragments). The influence of self-assembly conditions is studied by optical microscopy, and the nanocrystal circularity, aspect ratio, and size are quantified by transmission electron microscopy with additional insights into the superlattice structure provided by X-ray nanodiffraction. The results suggest that rhombic shapes arise from a subpopulation of nanocrystals with broader size and shape dispersions, whereas more uniform nanocrystals form rectangular structures (either solid or hollow). The solvent evaporation dynamics and diffusion of the drying liquid contribute to forming more complex shapes, such as nested frames and cracked and multidomain superlattices.}},
  author       = {{Gomes Ferreira, Matheus and Gastin, Baptiste and Hiller, Jonas and A. Zaluzhnyy, Ivan and N. Hinsley, Gerard and Wang, Bihan and Hoon Ngoi, Kuan and A. Vartanyants, Ivan and Schreiber, Frank and Scheele, Marcus and Baranov, Dmitry}},
  issn         = {{2688-4062}},
  language     = {{eng}},
  month        = {{05}},
  publisher    = {{Wiley}},
  series       = {{Small Structures}},
  title        = {{Self-Assembly of Quantum-Confined CsPbBr<sub>3</sub> Perovskite Nanocrystals into Rhombic, Frame, and Rectangular Superlattices}},
  url          = {{http://dx.doi.org/10.1002/sstr.202500133}},
  doi          = {{10.1002/sstr.202500133}},
  year         = {{2025}},
}