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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

352
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...
352
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
259
P-N junction01:11

P-N junction

536
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...
536

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Light-Emitting Plasmonic Tunneling Junctions: Current Status and Perspectives.

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Area of Science:

  • Quantum phenomena
  • Plasmonics
  • Nanotechnology

Background:

  • Quantum tunneling allows electrons to pass through potential barriers, a phenomenon without classical explanation.
  • In metallic nanogaps, inelastic electron tunneling excites deep-subwavelength plasmon modes.
  • This process is driven by an externally applied voltage.

Purpose of the Study:

  • To review the state-of-the-art in plasmonic tunneling junctions.
  • To highlight advancements in efficiency, construction, and control.
  • To explore the integration of electrically driven optical antennas.

Main Methods:

  • Review of plasmon generation mechanisms in inelastic electron tunneling.
  • Analysis of current research on plasmonic tunneling junctions.
  • Discussion of efficiency improvements and precise construction techniques.

Main Results:

  • Inelastic electron tunneling directly excites plasmon modes in nanogaps.
  • Plasmonic tunneling junctions show potential for next-generation light sources.
  • Key areas for improvement include efficiency, precise construction, and active control.

Conclusions:

  • Electrically driven plasmon generation via quantum tunneling is a promising field.
  • Further research is needed for practical applications in ultracompact, ultrafast light sources.
  • Integration with optical antennas is a critical future direction.