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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

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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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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.
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Bipolar Junction Transistor01:22

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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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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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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Related Experiment Video

Updated: Aug 25, 2025

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
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A steep switching WSe2 impact ionization field-effect transistor.

Haeju Choi1, Jinshu Li1, Taeho Kang1

  • 1SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, 440-746, Korea.

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|October 14, 2022
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Summary

Researchers developed steep-slope impact ionization field-effect transistors (I²FETs) using WSe₂. These transistors achieve a low subthreshold slope (SS) and high on/off ratios, paving the way for energy-efficient electronics.

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Device Engineering

Background:

  • Fermi-Dirac carrier distribution and drift-diffusion transport limit subthreshold slope (SS) in field-effect transistors (FETs).
  • Reducing SS is crucial for optimizing energy consumption in electronic devices.

Purpose of the Study:

  • To realize steep-slope impact ionization field-effect transistors (I²FETs) overcoming SS limitations.
  • To investigate the carrier transport mechanisms in WSe₂ for low SS devices.
  • To demonstrate the functionality of I²FETs in logic circuits.

Main Methods:

  • Fabrication of gate-controlled homogeneous WSe₂ lateral junction I²FETs.
  • Characterization of device performance including subthreshold slope and on/off ratio at room temperature and low bias.
  • Investigation of carrier transport mechanisms, specifically the lucky-drift mechanism.
  • Construction and testing of a logic inverter using a WSe₂ I²FET and a MoS₂ FET.

Main Results:

  • Achieved average SS down to 2.73 mV/dec over three decades of source-drain current.
  • Demonstrated an on/off ratio of approximately 10⁶ at room temperature and low bias (<1 V).
  • Confirmed the validity of the lucky-drift mechanism in WSe₂, enabling high impact ionization coefficients and low SS.
  • Fabricated a logic inverter with a gain of 73 and near-ideal noise margins.

Conclusions:

  • WSe₂ I²FETs offer a promising route to overcome fundamental barriers in FET design.
  • The demonstrated devices exhibit excellent performance for energy-efficient electronic applications.
  • This work provides a foundation for the development of next-generation low-power electronic devices.