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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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Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
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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.
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Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
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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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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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Related Experiment Video

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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A subthermionic tunnel field-effect transistor with an atomically thin channel.

Deblina Sarkar1, Xuejun Xie1, Wei Liu1

  • 1Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA.

Nature
|October 4, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed novel band-to-band tunnel field-effect transistors (tunnel-FETs) using 2D materials. These advanced tunnel-FETs achieve subthermionic subthreshold swing, enabling continued scaling of electronics without increased power consumption.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Silicon-based transistors face scaling limitations due to degraded electrostatics and the thermionic limit of subthreshold swing.
  • Two-dimensional (2D) semiconductors offer improved electrostatic control at reduced channel lengths.
  • Overcoming the subthreshold swing limit is crucial for continued power-efficient scaling in integrated circuits.

Purpose of the Study:

  • To demonstrate band-to-band tunnel field-effect transistors (tunnel-FETs) utilizing 2D semiconductors.
  • To achieve subthermionic subthreshold swing for low-power electronic applications.
  • To explore novel heterostructures for enhanced transistor performance.

Main Methods:

  • Fabrication of vertical heterostructure tunnel-FETs using highly doped germanium and atomically thin molybdenum disulfide.
  • Utilizing a 2D semiconductor channel for improved electrostatic control.
  • Characterization of device performance, including subthreshold swing and drain current characteristics at room temperature.

Main Results:

  • Demonstrated tunnel-FETs with a minimum subthreshold swing of 3.9 mV/decade and an average of 31.1 mV/decade over four decades of drain current.
  • Achieved subthermionic subthreshold swing at a low power-supply voltage of 0.1 V.
  • Developed the thinnest-channel subthermionic transistor to date with a planar architecture.

Conclusions:

  • The developed ATLAS-TFET (atomically thin and layered semiconducting-channel tunnel-FET) achieves subthermionic performance, overcoming key limitations of conventional transistors.
  • This technology enables continued scaling of integrated circuits with reduced power consumption.
  • Potential applications include ultra-dense, low-power electronics and highly sensitive biosensors and gas sensors.