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Related Concept Videos

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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MOSFET: Enhancement Mode01:22

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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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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.
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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 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.
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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Related Experiment Video

Updated: Jul 31, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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GaN/Gr (2D)/Si (3D) Combined High-Performance Hot Electron Transistors.

Can Zou1, Zixuan Zhao1, Mingjun Xu1

  • 1Guangdong Engineering Research Center of Optoelectronic Functional Materials and Devices, School of Semiconductor Science and Technology, South China Normal University, Guangzhou 510631, People's Republic of China.

ACS Nano
|May 1, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel mixed-dimensional hot electron transistor (HET) using GaN/AlN microwires and graphene for high-speed electronics. The device achieves record DC gain and high on/off ratio, showing potential for power amplifiers.

Keywords:
Sigallium nitridegraphenehot electron transistormixed-dimensiontunneling

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Semiconductor Device Physics

Background:

  • Bipolar transistors suffer from minority carrier storage time, limiting switching speed.
  • Hot electron transistors (HETs) offer high working speeds and potential for complex logic functions.
  • Existing graphene hot electron transistors (GHETs) have limitations in collection efficiency and current saturation.

Purpose of the Study:

  • To demonstrate a mixed-dimensional HET utilizing GaN/AlN microwires, graphene, and silicon.
  • To achieve high-speed hot electron injection and transport for improved transistor performance.
  • To explore the potential of this novel HET architecture for power amplifier applications.

Main Methods:

  • Fabrication of a mixed-dimensional HET device comprising GaN/AlN microwires, graphene (Gr), and Si.
  • Utilizing Fowler-Nordheim (F-N) tunneling for injecting electrons into graphene.
  • Achieving ballistic transport of hot electrons across graphene and low-barrier collection in Si.

Main Results:

  • Record DC gain of 16.2 achieved.
  • Collection efficiency close to the theoretical limit of 99.9% demonstrated.
  • High emitter current density of ~68.7 A/cm² and an on/off current ratio of ~10⁷.
  • Wide current saturation range exceeding typical GHETs.

Conclusions:

  • The mixed-dimensional HET exhibits excellent performance metrics, including high gain, efficiency, and current ratio.
  • The device design overcomes limitations of previous GHETs, particularly in collection efficiency and saturation range.
  • This novel HET architecture holds significant promise for advanced electronic applications, especially as power amplifiers.