Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Semiconductors

Semiconductors

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...

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

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...

Metal-Semiconductor Junctions

Metal-Semiconductor Junctions

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 semiconductor's...

P-N junction

P-N junction

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...

Imperfections in Crystal Structure: Stoichiometric Point Defects

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

Carrier Generation and Recombination

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Microscopic Mechanism and Fluctuation-Dissipation of Methane Hydrate Decomposition in Oil-Containing Systems.

Langmuir : the ACS journal of surfaces and colloids·2025

Same author

Tailoring thermal transport and confinement effect of GaN/Si<sub>3</sub>N<sub>4</sub>nanowires utilizing core-shell architecture.

Journal of physics. Condensed matter : an Institute of Physics journal·2024

Same author

Localized Phonon Transport Study of GaN/SiO<sub>2</sub> Core/shell Nanowires under Thermal-Stress Coupling.

Langmuir : the ACS journal of surfaces and colloids·2024

Same author

Nanostructured Er2O3 thin films grown by metalorganic chemical vapour deposition.

Journal of nanoscience and nanotechnology·2014

Same author

Alterations in amplitude of low frequency fluctuation in treatment-naïve major depressive disorder measured with resting-state fMRI.

Human brain mapping·2014

Same author

The inhibitory and apoptotic effects of docetaxel-loaded mesoporous magnetic colloidal nanocrystal clusters on bladder cancer T24 cells in vitro.

Journal of biomedical nanotechnology·2014

Search research articles

Related Experiment Video

Updated: Jul 4, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Vacancy Defect Modulated Interfacial Thermal Transport and Phonon Localization in AlGaN/GaN Heterojunctions.

Zumeng Shan¹, Xin Li², Zhaoliang Wang¹

¹Department of Energy and Power Engineering, China University of Petroleum (East China), Qingdao 266580, China.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 2, 2026

Summary

This summary is machine-generated.

Vacancy defects in AlGaN/GaN heterojunctions play a dual role in heat dissipation. Understanding these defects is crucial for improving thermal management in GaN-based transistors.

More Related Videos

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Published on: July 17, 2015

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Related Experiment Videos

Last Updated: Jul 4, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Published on: July 17, 2015

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

AlGaN/GaN heterojunctions are vital for high electron mobility transistors.
Interfacial defects significantly impact heat dissipation in these devices.
Mechanisms of vacancy defect regulation on phonon transport are not well understood.

Purpose of the Study:

Investigate the influence of vacancy defects on interfacial thermal transport in AlGaN/GaN heterojunctions.
Elucidate the role of defect concentration and type on phonon behavior.
Provide insights for defect engineering and thermal management.

Main Methods:

Nonequilibrium molecular dynamics (NEMD) simulations.
Lattice dynamics analysis.
Correlation of defect characteristics with phonon transport.

Main Results:

Interfacial thermal conductance (ITC) shows nonmonotonic dependence on defect concentration.
At 0.5% vacancy concentration, ITC increases by 9.15% (GaN-side) and 5.72% (AlGaN-side).
Increased defect concentration strengthens phonon scattering, causing localization and suppressing heat conduction.

Conclusions:

Vacancy defects exhibit a dual regulatory role in interfacial thermal transport.
AlGaN is more sensitive to defects; GaN-side defects induce spectral reconstruction at high concentrations.
Findings offer theoretical guidance for optimizing GaN-based devices.