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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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
308

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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Dislocation Filter Based on LT-GaAs Layers for Monolithic GaAs/Si Integration.

Mikhail O Petrushkov1, Demid S Abramkin2,3, Eugeny A Emelyanov1

  • 1Laboratory of Physical Bases of Semiconductor Heterostructures Epitaxy, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia.

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|December 23, 2022
PubMed
Summary
This summary is machine-generated.

Low-temperature Gallium Arsenide (LT-GaAs) layers effectively filter dislocations in Gallium Arsenide/Silicon heterostructures. This method significantly improves structural properties for high-quality optoelectronic devices.

Keywords:
III-V/Si integrationdislocation filterlow-temperature GaAsmolecular-beam epitaxyself-assembled quantum dots

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Epitaxy

Background:

  • Heteroepitaxial growth of Gallium Arsenide (GaAs) on Silicon (Si) is crucial for integrating optoelectronic devices.
  • Dislocations in GaAs/Si heterostructures degrade device performance.

Purpose of the Study:

  • Investigate low-temperature (LT) GaAs layers as dislocation filters in GaAs/Si heterostructures.
  • Evaluate the impact of intermediate LT-GaAs layers and annealing on structural properties.
  • Assess the suitability of fabricated heterostructures for light-emitting devices.

Main Methods:

  • Utilized low-temperature (LT) Gallium Arsenide (GaAs) layers as intermediate buffer layers.
  • Applied post-growth and cyclic in situ annealing techniques.
  • Characterized structural properties including dislocation density, surface roughness, and non-radiative recombination centers.

Main Results:

  • Reduced threading dislocation density to 5 × 10^6 cm^-2.
  • Achieved root-mean-square surface roughness of 1.1 nm.
  • Lowered non-radiative recombination centers to levels comparable to homoepitaxial GaAs.

Conclusions:

  • LT-GaAs layers combined with cyclic annealing significantly enhance GaAs/Si heterostructure quality.
  • Elastic deformations and gallium vacancies in LT-GaAs contribute to improved structural properties.
  • The developed GaAs/Si heterostructures are suitable for high-quality light-emitting devices with self-assembled quantum dots.