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Related Concept Videos

Metallic Solids02:37

Metallic Solids

21.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
21.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

20.3K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
20.3K

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Updated: Mar 23, 2026

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

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Light-Induced Ordered Pattern Formation in 2D Copper Halide Perovskites.

Atreyie Ghosh1, Joseph L Spellberg1,2, Matthew Du1

  • 1James Franck Institute, University of Chicago, Chicago, Illinois 60637, United States.

Nano Letters
|March 21, 2026
PubMed
Summary
This summary is machine-generated.

Highly ordered patterns form in copper halide perovskites under UV light. Organic cations dictate pattern symmetry, revealing new ways to control material structures via electron-phonon coupling.

Keywords:
Emergent pattern formationhybrid organic−inorganic halide perovskitesphotoinduced material modification

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Metal halide perovskites typically degrade randomly.
  • Copper halide perovskites offer unique electronic and structural properties.

Purpose of the Study:

  • To investigate the photoinduced patterning in 2D copper halide perovskites.
  • To understand the role of organic cations in pattern formation and degradation.
  • To explore the underlying mechanisms of directional bond breaking.

Main Methods:

  • Ultraviolet illumination in ultrahigh vacuum.
  • Photoemission electron microscopy (PEEM).
  • Atomic force microscopy (AFM).
  • Scanning transmission electron microscopy (STEM) with spectroscopic analysis.
  • Nonequilibrium statistical mechanical calculations.

Main Results:

  • Formation of highly ordered, directional nanoscale grooves in (PEA)2CuCl4 and (iBuA)2CuCl4 perovskites.
  • Organic cation-dependent symmetries observed: 4-fold for (PEA)2CuCl4, 8-fold for (iBuA)2CuCl4.
  • Pattern formation linked to directional Cu-Cl bond breaking and metallic Cu nanoparticle formation.
  • Absence of ordered patterning in (MA)2CuCl4.

Conclusions:

  • Anisotropic electron-phonon coupling, influenced by organic cations, drives preferential bond breaking.
  • Elucidates degradation mechanisms in copper-based halide perovskites.
  • Demonstrates a pathway to control mesoscale material patterns using atomic-scale electron-phonon coupling.