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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Characteristics of MOSFET01:17

Characteristics of MOSFET

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Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
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MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

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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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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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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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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.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Nanowire Transistors with Bound-Charge Engineering.

Raphaël J Prentki1, Mohammed Harb2, Lei Liu2

  • 1Department of Physics, McGill University, 3600 rue University, Montréal, Québec H3A 2T8, Canada.

Physical Review Letters
|January 7, 2021
PubMed
Summary
This summary is machine-generated.

Engineered bound charges in silicon nanowires significantly boost transistor performance by improving electrical screening. This breakthrough enhances on-state current and enables low-power electronics.

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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Device Physics

Background:

  • Low-dimensional electronic systems, like silicon nanowires, suffer from weak screening, limiting nanodevice performance and scalability.
  • This poor screening particularly affects critical components such as tunnel field-effect transistors (TFETs).

Purpose of the Study:

  • To investigate methods for enhancing the screening effect in silicon nanowires.
  • To engineer bound charges at interfaces to improve device performance and enable low-power electronics.

Main Methods:

  • Atomistic quantum transport simulations were employed to model the electronic behavior.
  • Bound charges were engineered at the interfaces between silicon and low-κ (low dielectric constant) oxides.
  • A combination of low-κ and high-κ (high dielectric constant) oxides was utilized to maintain gate control.

Main Results:

  • Engineered bound charges significantly strengthen the screening effect in silicon nanowires.
  • On-state current in silicon nanowire tunnel field-effect transistors increased by orders of magnitude.
  • The strategic combination of oxides resulted in a minimal subthreshold swing, indicating improved gate control.

Conclusions:

  • Bound charge engineering at Si/oxide interfaces is a viable strategy to overcome weak screening limitations.
  • This approach offers a pathway to developing high-performance, low-power transistors.
  • The integration of low-κ and high-κ oxides is crucial for balancing screening enhancement and gate control.