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Field Effect Transistor

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...

MOSFET: Enhancement Mode

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...

MOSFET

MOSFET

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...

Characteristics of MOSFET

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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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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...

MOSFET: Depletion Mode

MOSFET: Depletion Mode

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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Updated: Jul 25, 2025

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Published on: February 1, 2022

Field-Effect Transistors Based on Single-Layer Graphene and Graphene-Derived Materials.

Octavian-Gabriel Simionescu¹, Andrei Avram¹, Bianca Adiaconiţă¹

¹National Institute for Research and Development in Microtechnologies-IMT Bucharest, 126A Erou Iancu Nicolae, 077190 Voluntari, Romania.

|June 28, 2023

Summary

This study compares graphenic materials for field-effect transistor (FET) biosensors. Bulk nanocrystalline graphite (bulk-NCG) FETs show enhanced electrical conductance and sensitivity after gold nanoparticle functionalization.

Keywords:

bulk nanocrystalline graphite (bulk-NCG)field-effect transistor (FET)graphene/graphite nanowalls (GNW)single-layer graphene (SLG)

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Area of Science:

Advanced materials science
Nanoelectronics
Biosensor technology

Background:

Field-effect transistors (FETs) are promising for biosensing due to material versatility and signal amplification.
Graphene and graphene-derived materials (GDMs) offer unique properties for high-performance biosensors.
Demand for cost-effective, easily fabricated, and high-performance biosensing materials is increasing.

Purpose of the Study:

To conduct a first-time comparative experimental study of FETs using single-layer graphene (SLG), graphene/graphite nanowalls (GNW), and bulk nanocrystalline graphite (bulk-NCG).
To evaluate the performance of these graphenic materials in FET biosensor applications.
To investigate the impact of gold nanoparticle functionalization on device sensitivity.

Main Methods:

Fabrication of FETs with channels made from SLG, GNW, and bulk-NCG.
Characterization using scanning electron microscopy (SEM) and Raman spectroscopy.
Electrical performance evaluation through I-V measurements and transconductance analysis.

Main Results:

Bulk-NCG-based FETs exhibited increased electrical conductance despite higher defect density.
Bulk-NCG FETs achieved a transconductance up to 4.9×10⁻³ A V⁻¹ and charge carrier mobility of 2.86×10⁻⁴ cm² V⁻¹ s⁻¹ at 3V.
Gold nanoparticle functionalization significantly improved sensitivity, increasing the ON/OFF current ratio by over four times (from ~178.95 to ~746.43) for bulk-NCG FETs.

Conclusions:

Bulk nanocrystalline graphite is a competitive material for FET biosensor fabrication.
The enhanced electrical properties and sensitivity of bulk-NCG FETs make them suitable for advanced biosensing applications.
Gold nanoparticle functionalization offers a viable strategy to boost the sensitivity of graphenic FET biosensors.