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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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...
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...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
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...
Bipolar Junction Transistor01:22

Bipolar Junction Transistor

Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational characteristics.
The structure...
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...

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GaAs junction field effect transistors for low-temperature environments.

S R Forrest1, T M Sanders

  • 1Randall Laboratory of Physics, The University of Michigan, Ann Arbor, MI 48109, USA.

The Review of Scientific Instruments
|November 1, 1978
PubMed
Summary
This summary is machine-generated.

Gallium arsenide (GaAs) junction field-effect transistors (FETs) exhibit low voltage noise at 4.2 K. Their stable performance across a wide temperature range makes them ideal for cryogenic applications.

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Area of Science:

  • Semiconductor Physics
  • Materials Science
  • Cryogenics

Background:

  • Gallium arsenide (GaAs) junction field-effect transistors (FETs) are crucial components in electronic devices.
  • Understanding their thermal, electrical, and noise characteristics is essential for optimizing performance, especially in demanding environments.

Purpose of the Study:

  • To characterize the thermal, electrical, and noise properties of a GaAs junction FET.
  • To evaluate its suitability for low-temperature applications.

Main Methods:

  • Experimental measurement of thermal properties.
  • Electrical characterization of the GaAs junction FET.
  • Analysis of low-frequency noise spectra at various temperatures.

Main Results:

  • The GaAs junction FET demonstrated low voltage noise levels of 1.5 ± 0.2 nV/(Hz)(1/2) at 4.2 K.
  • The device exhibited remarkable insensitivity to temperature variations between 1.3 K and 300 K.

Conclusions:

  • The characterized GaAs junction FET is highly suitable for low-temperature and cryogenic applications due to its minimal noise and stable performance.
  • These findings support the use of GaAs junction FETs in sensitive scientific instrumentation operating at cryogenic temperatures.