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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 operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Band gap opening in stanene induced by patterned B-N doping.

Priyanka Garg1, Indrani Choudhuri1, Arup Mahata1

  • 1Discipline of Chemistry, Indian Institute of Technology (IIT) Indore, Indore, M.P. 453552, India. biswarup@iiti.ac.in.

Physical Chemistry Chemical Physics : PCCP
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Stanene, a quantum spin Hall insulator, can be engineered for electronic devices. Boron-nitrogen co-doping opens its band gap, maintaining semiconducting properties under strain and showing potential for photocatalysts.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Stanene is a 2D material with quantum spin Hall insulator properties, showing promise for advanced electronic and optoelectronic applications.
  • Engineering the electronic properties of stanene is crucial for its practical device implementation.
  • Elemental doping offers a pathway to tune the band structure of 2D materials.

Purpose of the Study:

  • To investigate the effects of elemental mono-doping (Boron, Nitrogen) and co-doping (Boron-Nitrogen) on the electronic properties of stanene.
  • To explore patterned Boron-Nitrogen co-doping strategies for band gap engineering in stanene.
  • To assess the thermal stability and mechanical robustness of doped stanene systems.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to study band gap opening and electronic properties.
  • Molecular Dynamics (MD) simulations were used to evaluate the thermal stability of the doped stanene.
  • Stress-strain analysis was conducted to determine the mechanical stability under strain.

Main Results:

  • Elemental mono-doping and patterned Boron-Nitrogen co-doping successfully opened the band gap in stanene.
  • The semiconducting nature of the doped stanene was preserved even under applied strain.
  • Molecular Dynamics simulations confirmed the thermal stability of the doped system, comparable to pristine stanene.
  • Work function calculations indicated lower values for doped stanene compared to graphene, suggesting suitability for specific applications.

Conclusions:

  • Patterned Boron-Nitrogen co-doping is an effective strategy for tuning stanene's electronic properties and opening a band gap.
  • The resulting doped stanene exhibits robust semiconducting behavior under strain and good thermal stability.
  • The reduced work function of doped stanene positions it as a promising candidate for next-generation photocatalysts and electronic devices.