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Related Concept Videos

MOSFET01:16

MOSFET

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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
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Field Effect Transistor01:29

Field Effect Transistor

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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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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...
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MOSFET: Enhancement Mode01:22

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.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

358
Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
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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.
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Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
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High-Temperature and High-Electron Mobility Metal-Oxide-Semiconductor Field-Effect Transistors Based on N-Type

Meiyong Liao1, Huanying Sun1,2, Satoshi Koizumi1

  • 1Research Center for Electronic and Optical Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 3050044, Japan.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 20, 2024
PubMed
Summary

Researchers developed phosphorus-doped n-type diamond for integrated circuits. This breakthrough enables n-channel diamond metal-oxide-semiconductor field-effect transistors (MOSFETs), crucial for diamond complementary metal-oxide-semiconductor (CMOS) devices.

Keywords:
MOSFETn‐type conductivitysemiconductor diamond

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Electrical Engineering

Background:

  • Diamond exhibits superior material properties for next-generation electronics compared to silicon.
  • Achieving diamond complementary metal-oxide-semiconductor (CMOS) devices requires both n-type and p-type conductivity.
  • Development of n-channel metal-oxide-semiconductor field-effect transistors (MOSFETs) in diamond has been a significant challenge.

Purpose of the Study:

  • To fabricate an electronic-grade phosphorus-doped n-type diamond epilayer.
  • To demonstrate n-channel diamond MOSFETs for the advancement of diamond CMOS technology.

Main Methods:

  • Fabrication of an atomically flat, phosphorus-doped n-type diamond epilayer using step-flow nucleation.
  • Characterization of the fabricated n-type diamond epilayer and demonstration of n-channel MOSFETs.

Main Results:

  • Successful fabrication of electronic-grade n-type diamond with an atomically flat surface.
  • Demonstration of n-channel diamond MOSFETs.
  • Achieved high field-effect mobility of approximately 150 cm² V⁻¹ s⁻¹ at 573 K, the highest for n-channel wide-bandgap semiconductor MOSFETs.

Conclusions:

  • This work overcomes a critical hurdle in realizing diamond CMOS technology.
  • Enables the development of energy-efficient, high-reliability CMOS integrated circuits for demanding applications.
  • Paves the way for high-power electronics, integrated spintronics, and extreme sensors in harsh environments.