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Related Concept Videos

Field Effect Transistor01:29

Field Effect Transistor

904
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...
904
MOSFET01:16

MOSFET

905
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...
905
Biasing of FET01:22

Biasing of FET

541
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...
541
Characteristics of MOSFET01:17

Characteristics of MOSFET

737
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...
737
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

651
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...
651
Characteristics of JFET01:21

Characteristics of JFET

947
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...
947

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Biosensing based on field-effect transistors (FET): Recent progress and challenges.

Deniz Sadighbayan1,2, Mohammad Hasanzadeh2, Ebrahim Ghafar-Zadeh1,3

  • 1Biologically Inspired Sensors and Actuators (BioSA), Faculty of Science, Dept. of Biology, York University, Toronto, Canada.

Trends in Analytical Chemistry : TRAC
|October 14, 2020
PubMed
Summary

Field-Effect-Transistor (FET) biosensors offer efficient, label-free detection of biomarkers and pathogens. Nanotechnology integration enhances FET biosensor performance for diverse applications in diagnostics and drug development.

Keywords:
Advanced nanomaterialBiomarkersBiomedical analysisBiosensorBiotechnologyCancerField-effect-transistor

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Biosensing

Background:

  • Field-Effect-Transistor (FET) biosensors are advanced tools for early biomarker detection and drug screening.
  • Their non-metalized gate dielectrics transduce biological changes, enabling real-time, precise, specific, and label-free analyte detection.
  • Significant progress has been made in FET device design for biomedical diagnostics and cell-based assays.

Purpose of the Study:

  • To review the structural setup and working principles of various FET biosensor types.
  • To highlight recent advancements in FET biosensors for detecting viruses (e.g., COVID-19, Influenza, Hepatitis B), biomarkers, nucleic acids, bacteria, cells, and ions.
  • To discuss FET sensor development for drug discovery and cellular investigations, including strategies for enhancing sensitivity and selectivity.

Main Methods:

  • Review of existing literature on FET biosensor technology.
  • Analysis of structural designs and working principles of different FET devices.
  • Compilation of recent research on FET biosensor applications in various fields.

Main Results:

  • FET biosensors demonstrate high efficiency in real-time, label-free detection of diverse biomolecules.
  • Nanomaterial integration (graphene, nanoparticles, nanotubes) significantly boosts FET biosensor performance.
  • FET sensors are increasingly utilized for viral detection, biomarker analysis, and cellular studies.

Conclusions:

  • FET biosensors, especially with nanotechnology, are highly desirable for rapid, label-free biomolecule detection.
  • Continued development is expected to improve their performance and clinical utility for point-of-care applications.
  • Challenges remain in optimizing FET sensors for widespread clinical use and cellular investigations.