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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

522
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...
522
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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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

339
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...
339
Properties of Transition Metals02:58

Properties of Transition Metals

27.3K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
27.3K

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Pressure-Induced Metallization and Isostructural Transitions in 3R-MoS2.

Azkar Saeed Ahmad1,2, Mangladeep Bhullar3, Kenny Stahl4

  • 1Materials Science and Engineering Department, Guangdong Technion-Israel Institute of Technology, Shantou, 515063, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 27, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized 3R-molybdenum disulfide (MoS2) and discovered pressure-induced phase transitions. This transition from semiconductor to metal under pressure is crucial for developing advanced electronic devices.

Keywords:
high pressure‐temperature synthesisisostructural transitionsmetallizationtransition metal dichalcogenidesvan der Waals forces

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • 3R-polytypes of transition metal dichalcogenides (TMDs) exhibit unique properties due to their layer stacking.
  • Understanding structure-property relationships in TMDs is key for spintronic, valleytronic, and optoelectronic applications.

Purpose of the Study:

  • To synthesize 3R-molybdenum disulfide (MoS2) and investigate its structural and electronic properties under high pressure.
  • To explore pressure-induced phase transitions and their impact on material properties.

Main Methods:

  • High-pressure-temperature synthesis of 3R-MoS2 using a large volume cubic press.
  • Combined experimental and theoretical high-pressure studies.
  • Analysis of crystal and electronic structure under pressure.

Main Results:

  • Discovery of pressure-induced reversible isostructural phase transitions in 3R-MoS2 without symmetry breaking.
  • Observation of a semiconductor-to-metal transition concurrent with isostructural transitions.
  • Enhanced interlayer interactions and robust layer stacking prevent volume collapse under pressure.

Conclusions:

  • Continuous pressure-tuning of crystal and electronic structure in 3R-MoS2 is achievable.
  • The findings are vital for next-generation devices leveraging coupled structural, optical, and electrical properties.
  • This research advances the understanding of TMDs for novel electronic applications.