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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...
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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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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Heterointerface engineering of broken-gap InAs/GaSb multilayer structures.

Jheng-Sin Liu1, Yan Zhu, Patrick S Goley

  • 1Advanced Devices & Sustainable Energy Laboratory (ADSEL), Bradley Department of Electrical and Computer Engineering, Virginia Tech , Blacksburg, Virginia 24061, United States.

ACS Applied Materials & Interfaces
|January 9, 2015
PubMed
Summary

Strain-balanced Indium Arsenide/Gallium Antimonide (InAs/GaSb) multilayer structures were successfully grown using molecular beam epitaxy (MBE). These structures exhibit promising characteristics for advanced tunnel field-effect transistors.

Keywords:
InAs/GaSbbroken gapheterointerfacemolecular beam epitaxytunnel transistors

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Nanotechnology

Background:

  • Indium Arsenide/Gallium Antimonide (InAs/GaSb) heterostructures are crucial for advanced electronic devices.
  • Achieving strain balance in multilayer structures is key to optimizing their electronic properties.

Purpose of the Study:

  • To grow and characterize strain-balanced InAs/GaSb multilayer structures.
  • To analyze their structural, morphological, and band alignment properties.
  • To assess their suitability for high-performance, low-power tunnel field-effect transistors (TFETs).

Main Methods:

  • Molecular Beam Epitaxy (MBE) for precise layer growth.
  • Cross-sectional Transmission Electron Microscopy (TEM) for interface analysis.
  • X-ray analysis for structural confirmation.
  • X-ray Photoelectron Spectroscopy (XPS) for band alignment determination.

Main Results:

  • Strain-balanced InAs/GaSb multilayer structures with sharp heterointerfaces were achieved.
  • Lattice continuity observed across GaSb/InAs layers.
  • Smooth surface morphology with roughness of approximately 0.5 nm.
  • Effective barrier height of -0.15 eV at the GaSb/InAs heterointerface confirmed by XPS and simulation.

Conclusions:

  • The study demonstrates the successful fabrication of strain-balanced InAs/GaSb multilayer structures.
  • These materials possess desirable properties for high-performance and low-power TFET applications.
  • The findings support the use of mixed As/Sb material systems in next-generation electronics.