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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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. Many...
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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Layer-by-layer anionic diffusion in two-dimensional halide perovskite vertical heterostructures.

Akriti1, Enzheng Shi1,2, Stephen B Shiring1

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|February 12, 2021
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This summary is machine-generated.

Anionic diffusion in 2D halide perovskites is inhibited by organic cations, preventing degradation. A novel

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Chemistry

Background:

  • Anionic diffusion in hybrid halide perovskites impacts stability and device performance.
  • Two-dimensional (2D) halide perovskites enhance chemical stability and reduce anionic diffusion.
  • The role of organic cations in inhibiting diffusion at the perovskite-ligand interface requires fundamental understanding.

Purpose of the Study:

  • To quantitatively investigate anionic interdiffusion across atomically flat 2D vertical heterojunctions.
  • To elucidate the mechanism of anionic migration in 2D halide perovskites.
  • To propose a new model for anionic diffusion in these materials.

Main Methods:

  • Quantitative investigation of anionic interdiffusion.
  • Fabrication of atomically flat 2D vertical heterojunctions.
  • Development of a 'quantized' layer-by-layer diffusion model.

Main Results:

  • Halide diffusion in 2D perovskites deviates from classical diffusion models.
  • A 'quantized' layer-by-layer diffusion mechanism accurately describes anionic migration.
  • Organic cations play a crucial role in inhibiting anionic diffusion.

Conclusions:

  • The study provides critical insights into anionic diffusion mechanisms in 2D halide perovskites.
  • A new materials platform with enhanced stability for heterostructure integration is presented.
  • Understanding and controlling anionic diffusion is key to improving perovskite-based devices.