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Related Concept Videos

Theory of Metallic Conduction01:17

Theory of Metallic Conduction

The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
Electrical Conductivity01:13

Electrical Conductivity

In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
Boundary Conditions for Current Density01:25

Boundary Conditions for Current Density

Current density becomes discontinuous across an interface of materials with different electrical conductivities. The normal component of the current density is continuous across the boundary.
Resistivity01:22

Resistivity

When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Conductivity of an atomically defined metallic interface.

David J Oliver1, Jesse Maassen, Mehdi El Ouali

  • 1Department of Physics, McGill University, Montreal, QC, Canada H3A2T8. oliverd@physics.mcgill.ca

Proceedings of the National Academy of Sciences of the United States of America
|November 7, 2012
PubMed
Summary
This summary is machine-generated.

Electrical nanocontacts between gold and tungsten show reduced conduction due to electronic structure mismatch and mechanical defects. This impacts nanoelectronic device design and resistance.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Electrical nanocontacts are crucial for nanoelectronic devices.
  • Understanding intermetallic junctions with dissimilar electronic structures is key for device performance.

Purpose of the Study:

  • To investigate the electronic transport properties of mechanically formed gold-tungsten nanocontacts.
  • To identify the factors limiting ballistic conduction at this intermetallic interface.

Main Methods:

  • Atomically characterized nanoindentation experiments.
  • First-principles quantum transport calculations.

Main Results:

  • Significant reduction in ballistic conduction across the gold-tungsten interface.
  • Conduction mismatch between s-wave (gold) and d-wave (tungsten) electron modes.
  • Mechanical formation introduces defects, increasing junction resistance up to tenfold.

Conclusions:

  • Electronic structure mismatch and mechanical defects fundamentally limit conduction in gold-tungsten nanocontacts.
  • Findings are relevant for nanoelectronics and semiconductor device design.
  • The employed technique is applicable to molecular electronics and nanoscale mechanics.