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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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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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General Model for Defect Dynamics in Ionizing-Irradiated SiO2 -Si Structures.

Yu Song1,2, Guanghui Zhang2, Xuefen Cai3

  • 1College of Physics and Electronic Information Engineering, Neijiang Normal University, Neijiang, 641112, China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 11, 2022
PubMed
Summary
This summary is machine-generated.

New models explain irradiation damage in semiconductor devices. Hole migration and reversible defect conversion are key to understanding defect concentrations under varying dose rates.

Keywords:
dispersive migrationionizing-irradiated SiO 2-Si structuresrecombination-enhanced defect reaction“phonon-kick” mechanism

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Area of Science:

  • Semiconductor device physics
  • Materials science
  • Radiation effects

Background:

  • Irradiation damage impacts semiconductor reliability in extreme environments.
  • Existing models fail to explain observed defect concentration dose dependence, especially at low dose rates.
  • Traditional models assume uniform hole generation and irreversible interface defect conversion.

Purpose of the Study:

  • To propose a new model for ionizing-irradiation-induced damage in SiO2-Si structures.
  • To explain the dose dependence of defect concentrations across a wide range of dose rates.
  • To incorporate dispersive hole migration and reversible interface defect conversion into the damage model.

Main Methods:

  • Developing an analytic model based on dispersive hole migration in disordered silica.
  • Incorporating a "phonon-kick" effect to explain reversible conversion between interface defects.
  • Conducting experimental studies to validate the proposed model.

Main Results:

  • The new model accurately explains the dose dependence of defect concentrations.
  • Dispersive hole migration decelerates center generation.
  • Reversible conversion between and Pb centers is facilitated by a phonon-kick effect.
  • The model is consistent across an extremely wide dose rate range.

Conclusions:

  • The proposed model provides a more accurate understanding of irradiation damage in semiconductor devices.
  • Dispersive hole migration and reversible defect conversion are critical factors in predicting device reliability.
  • This work resolves fundamental puzzles in defect concentration dose dependence.