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Semiconductors01:22

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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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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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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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Researchers explored novel phosphidotrielates and -tetrelates, discovering direct band gaps in several compounds. These new semiconductors, including Na3In2P3, show potential for optoelectronic applications.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Semiconductor Physics

Background:

  • Ternary phosphidotrielates and -tetrelates are known for ionic conductivity.
  • Electronic structures of these compounds have received limited attention.
  • Understanding electronic properties is crucial for developing new functional materials.

Purpose of the Study:

  • To investigate the electronic structures of known phosphidotrielates.
  • To synthesize and characterize a novel phosphidotrielate, Na3In2P3.
  • To identify compounds with direct band gaps for optoelectronic applications.

Main Methods:

  • Synthesis and crystal structure determination of Na3In2P3.
  • UV-Vis reflectance spectroscopy to determine band gaps.
  • Quantum chemical calculations to confirm band gap properties.

Main Results:

  • Direct band gaps were observed in Li3AlP2, Li3GaP2, Li3InP2, Na3InP2, and Na3In2P3.
  • Band gaps decrease across the series: Li3AlP2 (2.45 eV) to Na3In2P3 (1.27 eV).
  • All compounds feature EP4 tetrahedra, with variations in sharing patterns.

Conclusions:

  • The investigated phosphidotrielates exhibit direct band gaps in the visible light region.
  • These materials are promising for optoelectronic device applications.
  • The findings offer guidance for designing novel functional semiconductors.