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Related Concept Videos

MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

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 arises...
MOSFET01:16

MOSFET

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.
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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 Junctions01:24

Metal-Semiconductor Junctions

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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...
Field Effect Transistor01:29

Field Effect Transistor

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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Characteristics of MOSFET

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Related Experiment Video

Updated: May 26, 2026

Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
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Surface channel MESFETs on hydrogenated diamond.

G Conte1, E Giovine, A Bolshakov

  • 1University Roma Tre, Via Vasca Navale 84, 00146 Rome, Italy. gconte@uniroma3.it

Nanotechnology
|December 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers fabricated metal-semiconductor field-effect transistors (MESFETs) using hydrogen-terminated diamond. Optimized self-aligned gate structures improved device performance, achieving high mobility and frequency characteristics for advanced electronics.

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Device Engineering

Background:

  • Hydrogen-terminated diamond exhibits unique electronic properties.
  • Metal-semiconductor field-effect transistors (MESFETs) are crucial for high-frequency applications.
  • Substrate quality significantly impacts diamond-based device performance.

Purpose of the Study:

  • To fabricate and optimize MESFETs using hydrogen-terminated diamond.
  • To investigate the influence of gate structure on device performance.
  • To achieve high-frequency operation and improved DC characteristics.

Main Methods:

  • Fabrication of MESFETs with varying layouts on single crystal and polycrystalline diamond.
  • Use of aluminum gates and gold ohmic contacts.
  • Characterization using Hall bars, transfer length structures, and electrical measurements.

Main Results:

  • Achieved room temperature Hall and field-effect mobility >100 cm²/V·s.
  • Demonstrated stable and repeatable sheet resistances due to hydrogen-induced 2D hole gas.
  • Self-aligned 400 nm gate length FETs showed current density >100 mA/mm and transconductance >40 mS/mm.
  • 200 nm gate length devices achieved fMax=26.4 GHz and fT=13.2 GHz on single crystal diamond.

Conclusions:

  • Optimized self-aligned gate structures enhance DC characteristics and high-frequency performance.
  • Diamond MESFETs offer promising potential for high-speed electronic applications.
  • Substrate quality and fabrication process are critical for repeatable device performance.