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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...
538
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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Carrier Transport01:21

Carrier Transport

590
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
590
Fermi Level Dynamics01:12

Fermi Level Dynamics

361
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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P-N junction01:11

P-N junction

709
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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Biasing of P-N Junction01:16

Biasing of P-N Junction

940
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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Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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Charge kinetics across a negatively biased semiconducting plasma-solid interface.

K Rasek1, F X Bronold1, H Fehske1

  • 1Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany.

Physical Review. E
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Summary
This summary is machine-generated.

This study reveals that hot carriers drive current across semiconductor-plasma interfaces, challenging the perfect absorber model. Understanding electron microphysics is crucial for accurate charge transport analysis.

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Area of Science:

  • Plasma physics
  • Semiconductor physics
  • Materials science

Background:

  • Investigating plasma-solid interfaces is key for electronic device applications.
  • Understanding charge transport mechanisms at these interfaces is complex.
  • Existing models may not fully capture semiconductor interface behavior.

Purpose of the Study:

  • To investigate self-consistent ambipolar charge kinetics at a negatively biased semiconducting plasma-solid interface.
  • To analyze the current-voltage characteristics of a germanium layer under plasma exposure.
  • To visualize charge carrier behavior and distributions within the semiconductor layer.

Main Methods:

  • Numerical calculation of current-voltage characteristics.
  • Analysis of spatially and energetically resolved charge carrier fluxes and distributions.
  • Modeling a thin germanium layer with nonpolar electron-phonon scattering interfacing with argon plasma.

Main Results:

  • The semiconductor's electron microphysics significantly impacts the current-voltage characteristic.
  • Charge transport is mediated by relatively hot carriers.
  • The perfect absorber model is inadequate for describing charge transport across semiconducting interfaces.

Conclusions:

  • Hot carrier transport is a critical factor at plasma-semiconductor interfaces.
  • The perfect absorber model requires revision for semiconducting interfaces.
  • Further refinement of semiconductor band structure models and inclusion of scattering processes are needed for quantitative accuracy.