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Matheus Gomes Ferreira. Portrait.

Matheus Gomes Ferreira

Doctoral student

Matheus Gomes Ferreira. Portrait.

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

Author

  • Matheus Gomes Ferreira
  • Baptiste Gastin
  • Jonas Hiller
  • Ivan A. Zaluzhnyy
  • Gerard N. Hinsley
  • Bihan Wang
  • Kuan Hoon Ngoi
  • Ivan A. Vartanyants
  • Frank Schreiber
  • Marcus Scheele
  • Dmitry Baranov
Show all

Summary, in English

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.

Department/s

  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • LU Profile Area: Light and Materials
  • LTH Profile Area: Nanoscience and Semiconductor Technology

Publishing year

2025

Language

English

Publication/Series

Small Structures

Volume

26

Issue

9

Document type

Journal article

Publisher

Wiley

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)
  • Materials Chemistry

Status

Published

Project

  • Engineering of Superfluorescent Nanocrystal Solids
  • Tennbaserade nanostrukturer för optisk kvantteknologi

ISBN/ISSN/Other

  • ISSN: 2688-4062