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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

907
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.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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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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P-N junction01:11

P-N junction

1.7K
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...
1.7K
Biasing of FET01:22

Biasing of FET

1.0K
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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Field Effect Transistor01:29

Field Effect Transistor

1.8K
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...
1.8K
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.4K
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Related Experiment Video

Updated: May 1, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Gate tunable nonlinear rectification effects in three-terminal graphene nanojunctions.

R J Zhu1, Y Q Huang, N Kang

  • 1School of Physics and Optoelectronic Technology, College of Advanced Science and Technology, Dalian University of Technology, Dalian 116024, China.

Nanoscale
|March 25, 2014
PubMed
Summary

Graphene three-terminal junction devices exhibit room-temperature nonlinear charge transport with tunable rectification. These findings pave the way for novel nanoelectronics and nanoscale graphene property studies.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's unique electronic properties make it a promising material for next-generation electronic devices.
  • Understanding nonlinear charge transport is crucial for developing advanced nanoscale electronic components.

Purpose of the Study:

  • To investigate the room-temperature nonlinear charge transport properties of graphene three-terminal junction devices.
  • To explore the potential applications of these devices in nanoelectronics and materials characterization.

Main Methods:

  • Fabrication of graphene three-terminal junction devices.
  • Experimental measurement of charge transport characteristics under varying voltage and gate conditions.

Main Results:

  • Demonstrated rectification behavior in graphene three-terminal junction devices.
  • Observed that the rectification coefficient is tunable via gate voltage and depends on carrier polarity.
  • Showcased the V(2) scaling of the central terminal voltage output in a push-pull configuration.

Conclusions:

  • Graphene three-terminal junction devices exhibit significant nonlinear charge transport and rectification properties at room temperature.
  • These devices can serve as building blocks for novel nanoelectronic circuits.
  • The nonlinear transport characteristics offer a new method for probing graphene's electronic structure and thermoelectric properties at the nanoscale.