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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

935
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...
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Semiconductors01:22

Semiconductors

1.4K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.4K
Types of Semiconductors01:20

Types of Semiconductors

1.4K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
1.4K
Bonding in Metals02:32

Bonding in Metals

52.2K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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Quasi One-Dimensional Metal-Semiconductor Heterostructures.

S Benter1,2, V G Dubrovskii3, M Bartmann1

  • 1Institute of Solid State Electronics , TU Wien , Gußhausstraße 25-25a , 1040 Vienna , Austria.

Nano Letters
|May 24, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to create high-quality, single-crystalline metal-semiconductor nanowire heterostructures. This technique results in atomically sharp interfaces and the lowest Schottky barrier for GaAs-Au systems, enabling advanced nanodevices.

Keywords:
GaAsNanowiregoldmetal−semiconductor heterostructurequasi 1D contacts

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Metal-semiconductor heterostructures are crucial for advanced devices.
  • Nanowire heterostructures offer unique properties but often lack interface quality.
  • Achieving high-quality interfaces in quasi one-dimensional (1D) systems is challenging.

Purpose of the Study:

  • To develop a novel method for fabricating epitaxial, single-crystalline metal-semiconductor nanowire heterostructures.
  • To achieve atomically sharp interfaces in nanowire heterostructures.
  • To demonstrate a new self-assembled mechanism for creating axially stacked heterostructures.

Main Methods:

  • Utilized standard semiconductor processing techniques.
  • Employed spatially resolved Raman measurements to assess strain.
  • Applied flash lamp annealing for nanowire reconfiguration.
  • Conducted transmission electron microscopy (TEM) imaging and electrical characterization.

Main Results:

  • Demonstrated a new approach for epitaxial GaAs-Au nanowire heterostructures with atomically sharp interfaces.
  • Confirmed the absence of significant strain at the lattice-mismatched heterojunction.
  • Showcased a novel self-assembled mechanism for one-step reconfiguration of core-shell nanowires to axially stacked heterostructures.
  • Achieved the lowest reported Schottky barrier for the GaAs-Au system.

Conclusions:

  • The developed method enables the synthesis of high-quality metal-semiconductor nanowire heterostructures.
  • This approach facilitates research into high-quality interfaces for nanocontacts.
  • The technique holds potential for creating various other metal-semiconductor nanowire heterostructures.