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Related Concept Videos

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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Related Experiment Video

Updated: Jun 16, 2025

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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How Lattice Strain Affects Nonradiative Recombination and Mobility in FAPbI3.

Guangsheng Liu1, Mehri Ghasemi2, Qianwen Wei1

  • 1National Center for International Research on Photoelectric and Energy Materials, College of Materials and Energy, Yunnan University, Kunming, Yunnan Province 650091, China.

ACS Applied Materials & Interfaces
|June 14, 2025
PubMed
Summary

Lattice strain in hybrid organic-inorganic halide perovskites (HOIPs) significantly impacts solar cell performance. Compressive strain boosts electron mobility, while both strain types accelerate recombination, offering insights for device optimization.

Keywords:
carrier recombinationhalide perovskiteshot carrier coolinglattice strainnonadiabatic molecular dynamics

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Photovoltaics

Background:

  • Lattice strain in hybrid organic-inorganic halide perovskites (HOIPs) is critical for solar cell efficiency and stability.
  • Understanding strain's influence on charge carrier dynamics and light-induced strain is crucial but limited.

Purpose of the Study:

  • To investigate the effects of lattice strain on charge carrier dynamics in HOIPs.
  • To explore how light illumination induces dynamic lattice strain.
  • To provide insights for improving HOIP solar cell performance.

Main Methods:

  • Computational simulations were employed to model lattice strain effects.
  • Analysis focused on electron cooling, mobility, and recombination rates under strain.
  • Investigated photoinduced strain mechanisms involving Pb-I bonds and electron-phonon interactions.

Main Results:

  • 1% compressive strain delayed hot electron cooling and increased electron mobility by ~50%.
  • 1% tensile strain accelerated cooling and reduced electron mobility by ~37%.
  • Both compressive and tensile strains accelerated electron-hole recombination.

Conclusions:

  • Strain modulates lattice vibrations and energy levels, affecting carrier dynamics.
  • Photoinduced strain arises from Pb-I bond changes driven by electron-phonon coupling and anharmonicity.
  • Findings offer crucial insights for enhancing HOIP solar cell efficiency and stability.