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Related Concept Videos

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...
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.
In an n-MOSFET, the structure includes n-type source and drain...
Characteristics of MOSFET01:17

Characteristics of MOSFET

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 quicker...
Biasing of FET01:22

Biasing of FET

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 gate...
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.
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 current...
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...

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Assessment of Dendritic Arborization in the Dentate Gyrus of the Hippocampal Region in Mice
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van Hove Source for Ultralow Power Field-Effect Transistors.

Baizhe He1, Hang Zhou2, Yuqi Zhuang3

  • 1Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, School of Electronics, Peking University, Beijing 100871, China.

ACS Nano
|December 17, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel van Hove source (VHS) field-effect transistor (FET) using carbon nanotubes. This breakthrough achieves a subthreshold swing below the Boltzmann limit, enabling ultralow-power electronics.

Keywords:
1D SemiconductorsCarbon NanotubesCold-Source FETLow-Power ElectronicsSubthreshold Swingvan Hove singularity

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Field-effect transistors (FETs) are crucial for integrated circuits.
  • Achieving sub-60 mV/decade subthreshold swing (SS) at room temperature is key for ultralow-power electronics.
  • Conventional FETs face limitations due to the Boltzmann limit on switching performance.

Purpose of the Study:

  • To present a van Hove source (VHS) FET that overcomes the Boltzmann limit.
  • To demonstrate steep switching behavior in FETs using one-dimensional (1D) semiconductors.
  • To enable next-generation ultralow-power integrated circuits (ICs).

Main Methods:

  • Exploiting the steeply declining density of states (DOS) at the van Hove singularity in 1D semiconductors.
  • Constructing VHS FETs using individual semiconducting carbon nanotubes (CNTs).
  • Electrostatic tuning of the source Fermi level via a control gate.

Main Results:

  • Achieved a room temperature SS of 49 mV/decade in VHS FETs.
  • Demonstrated comparable on-state current to 22nm silicon FETs at a reduced supply voltage (0.5 V vs 0.75 V).
  • VHS FETs exhibited steep switching performance.

Conclusions:

  • VHS engineering offers a generalizable pathway for 1D semiconductors to achieve lower SS.
  • The developed technology can lead to steep-slope transistors with ultralow power, high performance, and scalability.
  • This approach provides a route towards next-generation ultralow-power ICs.