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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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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.
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview01:19

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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
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Intrinsic defects on α, γ and δ-CsPbI

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Cesium lead iodide (CsPbI3) is a promising solar material but degrades in humid environments. Surface defects influence this phase transition, with specific defects like VPb and VI impacting CsPbI3 stability.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Photovoltaics

Background:

  • All-inorganic halide perovskites, particularly CsPbI3, show potential for solar photovoltaic applications.
  • CsPbI3 undergoes detrimental phase transitions (α to γ to δ) under environmental conditions, especially humidity, limiting its stability.
  • Surface intrinsic defects are crucial in mediating these phase transitions.

Purpose of the Study:

  • To investigate the role of intrinsic defects on the (001) surfaces of α, γ, and δ-CsPbI3 phases.
  • To understand how surface defect formation energies correlate with phase stability, particularly under humid conditions.
  • To provide theoretical guidance for enhancing the stability of CsPbI3 perovskites.

Main Methods:

  • First-principles calculations based on Density Functional Theory (DFT).
  • Analysis of intrinsic point defects (vacancies and interstitials) on the α, γ, and δ-CsPbI3 (001) surfaces.
  • Calculation of defect formation energies for various defect types across different phases and surfaces.

Main Results:

  • Defect formation energies on surfaces are generally similar to bulk values, except for VPb and VI.
  • VPb and VI formation energies increase on the α-CsPbI3 (001) surface, and VPb on the γ-CsPbI3 (001) surface, due to surface relaxation and Pb-I octahedron distortion.
  • Interstitial defects exhibit the lowest formation energy on the α-CsPbI3 (001) surface, while VCs vacancies are consistently the lowest across all phases, indicating Cs ion mobility.

Conclusions:

  • Surface relaxation and Pb-I octahedron distortion significantly influence defect energetics and surface stability.
  • The high mobility of Cs ions (low VCs formation energy) is a key factor in CsPbI3's phase transition behavior.
  • Understanding these surface defect properties offers a pathway to improve the environmental stability of all-inorganic halide perovskites for solar applications.