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Related Concept Videos

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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Metal-Semiconductor Junctions01:24

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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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P-N junction01:11

P-N junction

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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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Biasing of P-N Junction01:16

Biasing of P-N Junction

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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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MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Thermoelectric Optimization and Quantum-to-Classical Crossover in Gate-Controlled Two-Dimensional Semiconducting

Yu-Chang Chen1,2, Yu-Chen Chang1

  • 1Department of Electrophysics, National Yang Ming Chiao Tung University, 1001, Daxue Rd., Hsinchu City 300093, Taiwan.

ACS Nano
|September 25, 2025
PubMed
Summary

We explored thermoelectric properties of platinum-tungsten diselenide nanojunctions. Optimal performance (ZT > 2.3) was achieved in short junctions (3 nm) at high temperatures (500 K) by tuning gate voltage.

Keywords:
NEGF-DFTNEMDSeebeck coefficientZTquantum-to-classical crossovertransition metal dichalcogenide

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Thermoelectric materials offer potential for waste heat recovery and solid-state cooling.
  • Tuning electronic transport properties in low-dimensional systems is crucial for enhancing thermoelectric performance.
  • Tungsten diselenide (WSe2) is a promising 2D material for nanoelectronic applications.

Purpose of the Study:

  • To investigate the thermoelectric performance of platinum-tungsten diselenide (Pt-WSe2-Pt) nanojunctions.
  • To explore the impact of gate-tunable architectures and channel lengths on thermoelectric figure of merit (ZT).
  • To understand the underlying electron transport mechanisms and their relation to thermoelectric properties.

Main Methods:

  • Utilized first-principles simulations, including density functional theory (DFT) with VASP and NanoDCAL.
  • Employed nonequilibrium molecular dynamics (NEMD) simulations with LAMMPS.
  • Investigated nanojunctions with varying channel lengths (3-12 nm) and gate-tunable configurations.

Main Results:

  • Observed a gate- and temperature-controlled quantum-to-classical crossover in electron transport (tunneling to thermionic emission).
  • Demonstrated nontrivial dependencies of ZT on Seebeck coefficient, electrical, and thermal conductivities due to the crossover.
  • Achieved optimal ZT (>2.3) in the shortest (3 nm) junction at 500 K, where quantum tunneling and thermionic emission coexist.

Conclusions:

  • Maximizing ZT requires precise tuning of the chemical potential near the band gap edges.
  • High Seebeck coefficients in the insulating state do not guarantee high ZT due to low conductivity.
  • Short Pt-WSe2-Pt nanojunctions exhibit significant potential for efficient thermoelectric energy conversion at elevated temperatures.