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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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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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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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Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
817
Types of Semiconductors01:20

Types of Semiconductors

1.2K
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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Fermi Level Dynamics01:12

Fermi Level Dynamics

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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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Monolayer Semiconductor Auger Detector.

Colin Ming Earn Chow1, Hongyi Yu2,3, John R Schaibley1,4

  • 1Department of Physics, University of Washington, Seattle, Washington 98195, United States.

Nano Letters
|June 9, 2020
PubMed
Summary
This summary is machine-generated.

Researchers detected Auger-excited carriers in 2D semiconductors using a novel tunneling technique. This method reveals surprisingly strong Auger scattering, even under weak excitation, offering new insights into semiconductor relaxation processes.

Keywords:
Auger photocurrentexciton-hole Auger scatteringtunneling barriervan der Waals heterostructureweak excitation

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Semiconductor Physics

Background:

  • Auger recombination is a complex many-body process in semiconductors where electron-hole recombination energy excites other carriers.
  • This excess energy is typically lost as heat, making direct observation of Auger processes challenging.
  • Understanding carrier dynamics is crucial for designing efficient semiconductor devices.

Purpose of the Study:

  • To develop and demonstrate a novel technique for directly probing Auger-excited carriers in semiconductors.
  • To investigate the strength and characteristics of Auger scattering in 2D materials.
  • To expand the toolkit for studying carrier relaxation mechanisms in advanced materials.

Main Methods:

  • Utilized vertical van der Waals heterostructures comprising monolayer WSe2 (semiconductor) and hexagonal boron nitride (tunnel barrier).
  • Employed a tunneling current detection method to capture Auger-excited carriers escaping the semiconductor.
  • Applied resonant absorption to initiate Auger processes and measured negative photoconductance.

Main Results:

  • Successfully detected holes Auger-excited by both neutral and charged excitons.
  • Observed that Auger scattering is unexpectedly strong, even at low excitation levels.
  • Demonstrated a characteristic negative photoconductance signal linked to Auger processes.

Conclusions:

  • The developed tunneling technique provides a direct pathway to probe Auger-excited carriers.
  • Auger scattering in 2D materials like WSe2 is a significant and surprisingly potent phenomenon.
  • This research opens new avenues for studying carrier dynamics and energy relaxation in 2D systems.