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Related Concept Videos

Types of Semiconductors01:20

Types of Semiconductors

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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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P-N junction01:11

P-N junction

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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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Fermi Level Dynamics01:12

Fermi Level Dynamics

209
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.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

183
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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Biasing of P-N Junction01:16

Biasing of P-N Junction

379
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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The nitrogen-vacancy defect in Si1-xGex.

Stavros-Richard G Christopoulos1,2, Navaratnarajah Kuganathan3, Efstratia Sgourou4

  • 1Department of Computer Science, School of Computing and Engineering, University of Huddersfield, Huddersfield, HD4 6DJ, UK.

Scientific Reports
|March 27, 2025
PubMed
Summary

Nitrogen-vacancy defects in silicon germanium alloys are crucial for nanoelectronics. These defects are most stable in high silicon-content alloys, impacting electronic and optical properties.

Keywords:
Binding energyDFTDefectsDopingSi1 − xGex

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Computational Materials Science

Background:

  • Silicon germanium (Si1-xGex) is a key material in nanoelectronics.
  • Point defects and defect clusters significantly influence the properties of Si1-xGex, especially in nanoscale devices.
  • Nitrogen-vacancy (NV) defects in Si1-xGex are bound and can alter optical and electronic characteristics, necessitating detailed study.

Purpose of the Study:

  • To investigate the energetics and binding energies of nitrogen-vacancy (NV) pairs in Si1-xGex alloys.
  • To understand the influence of alloy composition and local germanium concentration on NV defect stability.
  • To provide insights for controlling NV defects in Si1-xGex for nanoelectronic applications.

Main Methods:

  • Utilized density functional theory (DFT) for defect energy calculations.
  • Employed the special quasirandom structures (SQS) method to model random Si1-xGex alloys.
  • Calculated the binding energies of substitutional nitrogen-vacancy pairs (NV).

Main Results:

  • The binding energies of NV defects are dependent on the nearest-neighbor germanium concentration and the overall Si1-xGex composition.
  • The study identified that NV defects exhibit the highest binding energies in Si1-xGex alloys with high silicon content.
  • This indicates a greater stability of NV defects under specific compositional conditions.

Conclusions:

  • The stability of nitrogen-vacancy defects in Si1-xGex alloys is strongly composition-dependent.
  • High silicon content in Si1-xGex alloys favors the formation of more stable NV defects.
  • These findings are critical for the precise control and application of NV defects in advanced nanoelectronic devices.