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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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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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Types of Semiconductors01:20

Types of Semiconductors

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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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Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
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MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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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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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Approaching ohmic contact to two-dimensional semiconductors.

Kailang Liu1, Peng Luo1, Wei Han1

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

Science Bulletin
|January 20, 2023
PubMed
Summary

Two-dimensional (2D) semiconductors face performance issues due to Schottky barriers at electrical contacts. This review explores strategies to overcome Fermi level pinning and achieve ohmic contacts for improved 2D device performance.

Keywords:
Fermi level pinningOhmic contactSchottky barrierTwo-dimensional semiconductor

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) semiconductors exhibit unique electronic and optoelectronic properties, driving significant research interest.
  • Device performance is severely limited by high Schottky barriers at electrical contacts, a problem exacerbated by Fermi level pinning.
  • Achieving efficient charge injection and extraction is critical for realizing the full potential of 2D semiconductor devices.

Purpose of the Study:

  • To analyze the fundamental causes of electrical contact problems in 2D semiconductor devices.
  • To review and categorize strategies for mitigating Fermi level pinning and enabling ohmic contacts.
  • To highlight performance enhancements in devices utilizing optimized contact geometries.

Main Methods:

  • Analysis of Fermi level pinning mechanisms in 2D materials.
  • Categorization of contact strategies based on geometric configurations.
  • Review of experimental results demonstrating improved device performance.

Main Results:

  • Identification of Fermi level pinning as a primary obstacle to ohmic contacts in 2D devices.
  • Summary of diverse strategies including work function engineering, interface modification, and novel contact geometries.
  • Demonstration of significant performance gains in electronic and optoelectronic devices with optimized contacts.

Conclusions:

  • Overcoming Fermi level pinning is essential for advancing 2D semiconductor technology.
  • Various contact strategies offer pathways to ohmic contacts, each with specific advantages and limitations.
  • This review provides a guideline for addressing electrical contact challenges in 2D semiconductor devices.