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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

390
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...
283

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Geometric control of diffusing elements on InAs semiconductor surfaces via metal contacts.

Sandra Benter1,2, Adam Jönsson3,4, Jonas Johansson5,3

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Lithographically defined metal patterns control surface element concentrations, preventing Indium droplet formation on Indium Arsenide. This method offers precise geometric control for compound semiconductor manufacturing.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Precise control over elemental composition is crucial for semiconductor synthesis and device fabrication.
  • Achieving local geometric control of synthesis parameters on compound semiconductors remains a significant challenge.
  • Incongruent evaporation of compound semiconductors, like Indium Arsenide (InAs), can lead to undesirable Indium droplet formation.

Purpose of the Study:

  • To propose and demonstrate a method for local geometric control of surface element concentrations using lithographically defined metal stacks.
  • To investigate the inhibition of Indium droplet formation on Indium Arsenide surfaces through surface concentration regulation.
  • To explore the application of this technique in bottom-up synthesis and top-down device definition on-chip.

Main Methods:

  • Utilized lithographically defined Aluminium/Palladium (Al/Pd) metal patterns on Indium Arsenide substrates.
  • Annealed samples at temperatures up to 600°C to observe the effect of metal patterns on Indium droplet formation.
  • Performed compositional and structural analysis, complemented by theoretical modeling, to understand the underlying mechanisms.

Main Results:

  • Al/Pd metal patterns successfully created well-defined droplet-free zones on the InAs surface during annealing.
  • The lateral geometry of the lithographic metal patterns was preserved after annealing.
  • Palladium (Pd) acted as a sink for free Indium (In) atoms, reducing surface concentration and inhibiting droplet formation, with Aluminium (Al) acting as a diffusion barrier influencing Pd's efficiency.

Conclusions:

  • Lithographically defined metal stacks provide effective local geometric control over surface element concentrations in compound semiconductors.
  • This approach successfully suppresses Indium droplet formation on InAs surfaces by managing Indium surface diffusion.
  • The proposed method is broadly applicable to general lithography-epitaxial manufacturing processes for compound semiconductors.