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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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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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Pressure-Dependent Behavior of Defect-Modulated Band Structure in Boron Arsenide.

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Summary

Single-crystal boron arsenide (BAs) exhibits high thermal conductivity. This study experimentally investigates its electronic properties using photoluminescence, revealing an indirect bandgap and impurity-related transitions.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Semiconductor Physics

Background:

  • Single-crystal boron arsenide (BAs) shows exceptional thermal conductivity, suggesting potential for thermal management applications.
  • Despite theoretical predictions of high carrier mobilities, experimental data on BAs electronic properties remain scarce.

Purpose of the Study:

  • To experimentally investigate the electronic properties of single-crystal BAs.
  • To understand the nature of electronic transitions and defect states in BAs.

Main Methods:

  • Photoluminescence (PL) spectroscopy was performed on single-crystal BAs at varying temperatures and pressures.
  • First-principles calculations and time-of-flight secondary-ion mass spectrometry (TOF-SIMS) were used for impurity analysis.

Main Results:

  • PL measurements confirmed an indirect bandgap in BAs.
  • Two donor-acceptor pair (DAP) recombination transitions were identified, attributed to silicon (Si) and carbon (C) impurities.
  • High-pressure studies revealed that increasing pressure causes the donor level to approach the conduction band minimum, influencing carrier release.

Conclusions:

  • The electronic properties of BAs are significantly influenced by Si and C impurities.
  • Pressure-dependent studies indicate that strain engineering can modulate carrier transport in BAs.
  • These findings pave the way for utilizing BAs in electronic devices through controlled manipulation of its properties.