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Related Concept Videos

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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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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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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Characteristics of JFET01:21

Characteristics of JFET

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Junction Field Effect Transistors (JFETs) exhibit specific operational characteristics based on the relationship between the drain current (id) and the drain-source voltage (Vds), along with varying gate-source voltages (Vgs).
The core of a JFET's operation is controlling drain current by modulating the gate-source voltage. When the drain and gate voltage are set to zero, the JFET exhibits no net current flow, representing a state of equilibrium. The drain current increases linearly as the...
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Switching of BJT01:22

Switching of BJT

563
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.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
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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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Updated: Oct 31, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Gate potential-controlled current switching in graphene Y-junctions.

F R V Araújo1,2, D R da Costa2, F N Lima1

  • 1Instituto Federal do Piauí-Campus São Raimundo Nonato, 64670-000, São Raimundo Nonato, PI, Brazil.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 28, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a graphene-based device acting as a current switch. Applying an electric field to the Y-shaped junction controls electron transport, enabling tunable current transmission for electronic applications.

Keywords:
Y-junctionballistic transportcurrent switchgraphenep–n junctiontransport properties

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Graphene nanoribbons offer unique electronic properties for novel device applications.
  • Controlling electron transport in nanoscale junctions is crucial for developing advanced electronic components.

Purpose of the Study:

  • To investigate ballistic electron transport in a three-terminal graphene Y-shaped junction.
  • To demonstrate current control via an applied gate potential in graphene p-n junctions.

Main Methods:

  • Utilizing the Landauer-Büttiker formalism and the tight-binding model.
  • Simulating electron transport in armchair-edged graphene nanoribbons with a gate potential.

Main Results:

  • The applied electric field effectively tunes current transmission between input and output leads.
  • Calculated conductance varies with Fermi energy, applied potential, and system size.

Conclusions:

  • The proposed graphene Y-junction device functions as an efficient current switch.
  • Gate-controlled refractive index modulation in graphene p-n junctions enables current control.