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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...
766
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

466
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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Fermi Level Dynamics01:12

Fermi Level Dynamics

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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...
547
P-N junction01:11

P-N junction

980
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...
980

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Plasmon-Driven Hot Electron Transfer at Atomically Sharp Metal-Semiconductor Nanojunctions.

Masiar Sistani1, Maximilian G Bartmann1, Nicholas A Güsken2

  • 1Institute of Solid State Electronics, Technische Universität Wien, Gußhausstraße 25-25a, 1040 Vienna, Austria.

ACS Photonics
|July 21, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel aluminum-germanium (Al-Ge) heterostructure device to study hot carrier transfer at the nanoscale. This platform allows electrostatic control over hot electron injection, enabling new applications in energy harvesting and photocatalysis.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Solid State Physics

Background:

  • Ultrascaled plasmonic devices offer potential for nanoscale light manipulation.
  • Surface plasmon decay into hot carriers is key for energy harvesting, photocatalysis, and photodetection.
  • Understanding hot carrier transfer at metal-semiconductor interfaces remains a challenge.

Purpose of the Study:

  • To introduce a monolithic aluminum-germanium (Al-Ge) heterostructure device.
  • To provide a platform for examining surface plasmon decay and hot electron transfer at an atomically sharp Schottky nanojunction.
  • To demonstrate electrostatic control over hot electron injection and energy distribution.

Main Methods:

  • Fabrication of a monolithic Al-Ge heterostructure device.
  • Utilizing a gated metal-semiconductor heterojunction for electrostatic control of the Schottky barrier height.
  • Investigating momentum matching and energy distribution of plasmon-driven hot electron injection.

Main Results:

  • Demonstrated electrostatic control of the Schottky barrier height at the Al-Ge interface.
  • Enabled hot electron filtering through electrostatic gating.
  • Showcased control over energy distribution of plasmon-driven hot electron injection via interband electron transfer in Ge.
  • Observed negative differential resistance.

Conclusions:

  • The Al-Ge heterostructure device serves as a powerful platform for studying plasmonic hot carrier dynamics.
  • Electrostatic control offers a new pathway for tailoring hot electron transfer at metal-semiconductor interfaces.
  • This work paves the way for advanced plasmonic devices in energy and optoelectronic applications.