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Related Concept Videos

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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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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Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Biasing of FET01:22

Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
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MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

430
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.
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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...
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Related Experiment Video

Updated: Aug 8, 2025

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
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Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization

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A steep-switching impact ionization-based threshold switching field-effect transistor.

Chanwoo Kang1, Haeju Choi1, Hyeonje Son1

  • 1SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SSKU), Suwon 16419, Korea. leesj@skku.edu.

Nanoscale
|March 1, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a new impact-ionization transistor using MoS2 and WSe2. This device achieves steep switching at room temperature, overcoming limitations of current electronics for energy-efficient computing.

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Area of Science:

  • Semiconductor device physics
  • Materials science
  • Nanoelectronics

Background:

  • Steep switching devices are crucial for efficient data processing, exceeding the Boltzmann limit.
  • Two-dimensional materials offer advantages for impact ionization transistors, but room-temperature stability and hot carrier issues persist.

Purpose of the Study:

  • To develop an impact-ionization-based threshold switching field-effect transistor (I²S-FET) with stable, steep switching at room temperature.
  • To address device performance degradation caused by impact ionization-induced hot carriers through structural design.

Main Methods:

  • Fabrication of an I²S-FET using a serial connection of MoS2 FET and WSe2 impact ionization-based threshold switch (I²S).
  • Structural design separating conducting and steep-switching regions to manage carrier transport and impact ionization.

Main Results:

  • Achieved repetitive steep switching with a low subthreshold swing (SS) of 32.8 mV dec⁻¹ at room temperature.
  • Demonstrated low dielectric injection efficiency (10⁻⁶) and hysteresis-free switching characteristics.
  • Successfully addressed hot carrier issues through the device's separated structural design.

Conclusions:

  • The presented I²S-FET offers a promising solution for next-generation energy-efficient electronic devices.
  • The device's design overcomes previous limitations in room-temperature steep switching and performance degradation.
  • This work paves the way for ultralow-power applications.