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Related Concept Videos

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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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

1.1K
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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

426
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...
426
P-N junction01:11

P-N junction

840
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...
840
Biasing of P-N Junction01:16

Biasing of P-N Junction

1.3K
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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2D Homojunctions for Electronics and Optoelectronics.

Fakun Wang1, Ke Pei1, Yuan Li1

  • 1State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|March 1, 2021
PubMed
Summary
This summary is machine-generated.

Two-dimensional (2D) homojunctions offer unique advantages for novel electronic and optoelectronic devices. This review details their design, preparation, and applications, highlighting future development.

Keywords:
2D materialselectronicshomojunctionsoptoelectronics

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials are gaining prominence in the post-Moore era due to their diverse physical properties.
  • 2D homojunctions, featuring homogeneous components and efficient charge transfer, are crucial for advanced electronic and optoelectronic devices.

Purpose of the Study:

  • To provide a comprehensive review of the structural design and device applications of 2D homojunctions.
  • To summarize preparation strategies and discuss current challenges and future perspectives in the field.

Main Methods:

  • Review of literature on 2D homojunctions, including p-n, heterophase, and layer-engineered types.
  • Detailed summary of preparation techniques: vapor-phase deposition, lithium intercalation, laser irradiation, chemical doping, electrostatic doping, and photodoping.

Main Results:

  • Exploration of 2D homojunction applications in electronics: field-effect transistors, rectifiers, and inverters.
  • Detailed review of 2D homojunction applications in optoelectronics: light-emitting diodes, photovoltaics, and photodetectors.

Conclusions:

  • 2D homojunctions are highly promising for next-generation electronic and optoelectronic devices.
  • Addressing current challenges is essential for accelerating the development and widespread adoption of 2D homojunction technologies.