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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 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...
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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.
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The work...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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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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MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Updated: Oct 21, 2025

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Migdal Effect in Semiconductors.

Simon Knapen1, Jonathan Kozaczuk2, Tongyan Lin2

  • 1CERN, Theoretical Physics Department, 1211 Geneva 23, Switzerland.

Physical Review Letters
|September 3, 2021
PubMed
Summary
This summary is machine-generated.

The Migdal effect in semiconductors, involving dark matter-nucleus scattering, is derived completely for the first time. This finding significantly boosts the sensitivity of experiments searching for sub-GeV dark matter.

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Area of Science:

  • Particle Physics
  • Condensed Matter Physics
  • Astrophysics

Background:

  • The Migdal effect describes inelastic electron excitation from atomic nuclei during collisions.
  • Detecting dark matter, particularly sub-GeV candidates, remains a significant challenge in physics.

Purpose of the Study:

  • To provide the first complete derivation of the Migdal effect in semiconductors from dark matter-nucleus scattering.
  • To explore the impact of multiphonon production on the Migdal effect rate.
  • To enhance the sensitivity of dark matter detection experiments.

Main Methods:

  • Derivation of the Migdal effect considering dark matter-nucleus scattering and multiphonon production.
  • Calculation of the material's energy loss function using density functional theory (DFT).

Main Results:

  • The Migdal effect rate is significantly higher in semiconductors compared to atomic targets due to smaller electron excitation gaps.
  • The derived rate is expressible via the material's energy loss function.

Conclusions:

  • Accounting for the Migdal effect in semiconductors substantially improves the potential sensitivity of experiments like DAMIC, SENSEI, and SuperCDMS.
  • Semiconductors offer a promising avenue for detecting low-mass dark matter.