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Related Concept Videos

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.
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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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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Updated: Sep 22, 2025

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Defect-gradient-induced Rashba effect in van der Waals PtSe2 layers.

Junhyeon Jo1, Jung Hwa Kim2, Choong H Kim3,4

  • 1Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea.

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|May 19, 2022
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Researchers engineered defect gradients in 2D PtSe2 films using plasma treatments. This symmetry breaking induces the Rashba effect, enabling new electronic applications by controlling electron spin and momentum.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Physics

Background:

  • Defect engineering is crucial for semiconductor technology and solid-state physics.
  • Artificial defect distributions can induce novel physical properties, particularly through symmetry breaking.

Purpose of the Study:

  • To demonstrate layer-by-layer defect-gradients in 2D Platinum Diselenide (PtSe2) films.
  • To induce and investigate the Rashba effect via broken spatial inversion symmetry.

Main Methods:

  • Selective plasma treatments to create defect gradients.
  • Scanning Transmission Electron Microscopy (STEM) for structural analysis.
  • First-principles density functional theory (DFT) calculations.

Main Results:

  • Successfully created layer-by-layer defect-gradients in 2D PtSe2 films.
  • Observed Se vacancies extending up to 7 nm with a linear Se/Pt ratio variation.
  • Demonstrated the Rashba effect through nonreciprocal transport behaviors and DFT validation.

Conclusions:

  • Layer-by-layer defect engineering in 2D PtSe2 breaks inversion symmetry, leading to the Rashba effect.
  • This approach offers a pathway for functional defect engineering for spintronic applications.
  • Entangling electron spin and momentum is key for emerging electronic devices.