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Related Concept Videos

Semiconductors01:22

Semiconductors

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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...
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Types of Semiconductors01:20

Types of Semiconductors

1.5K
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...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.1K
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...
1.1K
Lumber Defects01:23

Lumber Defects

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Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
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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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Band Theory02:35

Band Theory

17.3K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Stable Defects in Semiconductor Nanowires.

A M Sanchez1, J A Gott1, H A Fonseka1

  • 1Department of Physics , University of Warwick , Coventry CV4 7AL , United Kingdom.

Nano Letters
|April 7, 2018
PubMed
Summary
This summary is machine-generated.

Semiconductor nanowires host novel, topologically protected line defects, stable in nanoscale crystals. These defects, unlike dislocations, significantly impact optical properties by quenching light emission in defective regions.

Keywords:
CLNanowireSTEMdefects

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Semiconductor nanowires are typically assumed to be defect-free due to their self-purifying nature.
  • Existing models do not account for specific defect types prevalent in nanoscale crystalline structures.

Purpose of the Study:

  • To identify and characterize previously undiscovered line defects in semiconductor nanowires.
  • To investigate the stability and impact of these defects on nanowire microstructure and optical properties.

Main Methods:

  • Analysis of nanowire microstructures using a modified Burgers circuit method suitable for twinned materials.
  • Observation of defects in regions of imperfect crystal growth (nanowire tips).
  • Cathodoluminescence spectroscopy to assess the optical impact of identified defects.

Main Results:

  • Discovery of topologically protected line defects with a null Burgers vector, stable in nanoscale crystals.
  • Identification of common defect configurations: trapped defects, zero-total Burgers vector dipoles/groups, and null Burgers vector defects.
  • Characterization of a prevalent three-monolayer high twin facet with a zero Burgers vector.
  • Demonstration that defective regions act as nonradiative recombination centers, quenching optical emission.

Conclusions:

  • Semiconductor nanowire microstructures differ significantly from bulk materials, featuring unique, stable line defects.
  • Topologically protected null Burgers vector defects are a key feature of nanowire growth.
  • These defects critically influence the optoelectronic performance of semiconductor nanowires.