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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...
286
Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
291
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

207
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...
207
Biasing of P-N Junction01:16

Biasing of P-N Junction

408
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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P-N junction01:11

P-N junction

460
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...
460
Bipolar Junction Transistor01:22

Bipolar Junction Transistor

514
Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational...
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Related Experiment Video

Updated: Jun 2, 2025

Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
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κ/β-Ga2O3 Type-II Phase Heterojunction.

Yi Lu1, Patsy A Miranda Cortez1, Xiao Tang1

  • 1Advanced Semiconductor Laboratory, Electrical and Computer Engineering Program, Division of Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.

Advanced Materials (Deerfield Beach, Fla.)
|January 14, 2025
PubMed
Summary

Researchers created a new gallium oxide phase heterojunction with a type-II band alignment. This advancement significantly enhances deep ultraviolet photodetector performance, paving the way for novel electronic devices.

Keywords:
DUV detectiongallium oxide (Ga2O3)phase heterojunctionself‐powered devicetype‐II band alignment

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Semiconductor Devices

Background:

  • Ultrawide-bandgap gallium oxide (Ga2O3) is crucial for solar-blind photonics and high-power electronics.
  • Band alignments between different Ga2O3 polymorphs are poorly understood due to fabrication challenges.
  • Heterojunctions of different phases can exhibit unique band offsets despite similar stoichiometry.

Purpose of the Study:

  • To experimentally demonstrate a heterojunction between different gallium oxide phases (β-Ga2O3/κ-Ga2O3).
  • To investigate the band alignment and interfacial properties of this novel phase heterojunction.
  • To evaluate the performance of photodetectors based on this heterojunction for deep ultraviolet (DUV) applications.

Main Methods:

  • Fabrication of a β-Ga2O3/κ-Ga2O3 stacked phase heterojunction.
  • Characterization of the heterojunction interface and band alignment using electrical and optical measurements.
  • Fabrication and testing of photodetectors using bare β-Ga2O3, κ-Ga2O3, and the phase heterojunction.

Main Results:

  • Successful demonstration of a β-Ga2O3/κ-Ga2O3 phase heterojunction with a sharp interface.
  • Discovery of an unprecedented type-II band alignment with significant band offsets (≈0.65 eV/0.71 eV).
  • Phase heterojunction photodetector showed a responsivity increase of three orders of magnitude and improved response times under DUV illumination without external bias.

Conclusions:

  • The β-Ga2O3/κ-Ga2O3 phase heterojunction exhibits a type-II band alignment suitable for self-powered DUV detection.
  • The observed high responsivity and fast response times confirm a strong interfacial electric field, beneficial for electron-hole separation.
  • This work opens new avenues for utilizing phase heterojunctions in advanced electronic and photonic devices based on ultrawide-bandgap semiconductors.