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Related Concept Videos

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 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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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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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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Growth of Gold Dendritic Nanoforests on Titanium Nitride-coated Silicon Substrates
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Structural modifications due to interface chemistry at metal-nitride interfaces.

S K Yadav1, S Shao1, J Wang2

  • 1Materials Science and Technology Division, MST-8, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Scientific Reports
|November 28, 2015
PubMed
Summary

Strong metal-nitrogen bonds at Al/TiN and Al/VN interfaces cause unique structural changes. These interfaces favor faulted stacking structures with minimal fault energies, unlike interfaces with weaker bonds.

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Area of Science:

  • Materials Science
  • Computational Materials Science
  • Surface Science

Background:

  • Metal-nitride interfaces are crucial in various technological applications.
  • Understanding interfacial phenomena is key to designing advanced materials.
  • The influence of chemical bonding on interface structure requires further investigation.

Purpose of the Study:

  • To investigate interfacial structural modifications at metal-nitride interfaces.
  • To explore the role of metal-nitrogen affinity in determining interface properties.
  • To analyze the energetic favorability of different stacking structures.

Main Methods:

  • First-principles density functional theory (DFT) calculations were employed.
  • Analysis of interfacial structural modifications was performed.
  • Linear elasticity theory was used to predict misfit dislocations.

Main Results:

  • An unusual faulted stacking structure is energetically preferred at Al/TiN {111} and Al/VN {111} interfaces due to strong Al-N affinity.
  • Intrinsic and extrinsic stacking fault energies near Al layers are negligibly small.
  • This phenomenon is absent at Pt/TiN and Pt/VN interfaces due to weak Pt-N affinity.

Conclusions:

  • Interface chemistry significantly influences structural modifications at metal-nitride interfaces.
  • Strong metal-nitrogen bonds promote unique interfacial structures and low stacking fault energies.
  • Interfacial misfit dislocation characteristics correlate with interface structural energies.