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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Tetrahedral Complexes
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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.
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Computational Modulation in Electronic Structures of Halide Perovskites via Element/Dopant/Phase.

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Computational chemistry reveals how structural, elemental, surface, and defect engineering tune halide perovskite electronic properties. Understanding these factors is key for optimizing perovskite materials in optoelectronics and photovoltaics.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid-State Physics

Background:

  • Halide perovskites are promising for optoelectronic devices.
  • Tuning their electronic properties is crucial for performance.
  • Factors influencing band gaps require detailed investigation.

Purpose of the Study:

  • To investigate the electronic properties of halide perovskites using computational chemistry.
  • To analyze the impact of structural, compositional, surface, and defect engineering on band gaps.
  • To provide insights for tailoring perovskite materials for specific applications.

Main Methods:

  • Computational chemistry simulations.
  • Analysis of structural frameworks (cubic vs. tetragonal phases).
  • Investigation of elemental composition (A-site ionic radius effects).
  • Study of surface and defect engineering impacts on electronic properties.

Main Results:

  • Tetragonal perovskites generally have higher band gaps than cubic phases.
  • A-site ionic radius, particularly Cesium (Cs), significantly influences band gaps.
  • Surface orientation and composition critically affect electronic properties.
  • Defect engineering can induce semiconducting-to-metallic transitions.

Conclusions:

  • Structural, elemental, surface, and defect engineering are key variables for controlling halide perovskite electronic properties.
  • These findings are essential for designing advanced perovskite-based photovoltaic and optoelectronic devices.
  • Tailoring band gaps through these engineering strategies is achievable.