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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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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 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.
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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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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Growth of multiple WS2/SnS layered semiconductor heterojunctions.

Robert Browning1, Paul Plachinda1, Prasanna Padigi1

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This study explores WS2/SnS heterostructures, finding ambipolar behavior. However, hole mobility significantly drops due to crystal misalignment between the 2D van der Waals semiconductor layers.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) van der Waals semiconductors like WS2 and SnS offer unique electronic properties.
  • WS2 exhibits n-type behavior, while SnS demonstrates p-type conductivity.
  • Heterostructures combining different 2D materials are crucial for novel electronic devices.

Purpose of the Study:

  • To investigate the heteroepitaxy of WS2 and SnS 2D materials.
  • To characterize the electronic properties of WS2/SnS heterostructures.
  • To understand the factors influencing charge carrier mobility in these heterostructures.

Main Methods:

  • Atomic layer deposition (ALD) was used to grow alternating WS2 and SnS layers on 5 cm × 5 cm substrates.
  • Fabrication and characterization of back-gated transistors for individual WS2 and SnS films.
  • Electrical transport measurements at room temperature to determine carrier mobility.
  • Transmission electron microscopy (TEM) to analyze the crystallographic orientation and interface structure.

Main Results:

  • Individual WS2 transistors showed n-type behavior with a mobility of 12 cm²/V·s.
  • Individual SnS transistors exhibited p-type conductivity with a high hole mobility of 818 cm²/V·s.
  • The WS2/SnS heterostructure displayed ambipolar behavior, with electron mobility slightly enhanced compared to pure WS2.
  • A significant reduction in hole mobility was observed in the heterostructure.

Conclusions:

  • The heteroepitaxy of WS2 and SnS was successfully achieved using ALD.
  • The observed ambipolar behavior in the heterostructure is consistent with the combination of n-type WS2 and p-type SnS.
  • The substantial decrease in hole mobility is attributed to the perpendicular striation direction and 15-degree twist between WS2 and SnS layers, creating significant scattering at van der Waals interfaces.