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Related Concept Videos

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...
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...
MOSFET01:16

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...
Working Principle of BJT01:15

Working Principle of BJT

A Bipolar Junction Transistor (BJT), specifically a PNP transistor in a common-base configuration, effectively amplifies or switches electronic signals by controlling the flow of charge carriers. This discussion focuses on its operation in the active mode.
In the PNP configuration, the emitter is heavily doped with positive charge carriers (holes), while the base is lightly doped with negative carriers (electrons). This setup allows for a forward bias across the emitter-base junction,...
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...

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Updated: May 11, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
07:51

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

Published on: February 1, 2022

Vertical graphene-base hot-electron transistor.

Caifu Zeng1, Emil B Song, Minsheng Wang

  • 1Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.

Nano Letters
|May 15, 2013
PubMed
Summary
This summary is machine-generated.

Vertical graphene-base hot-electron transistors (GB-HETs) show high current on-off ratios due to efficient hot electron transport and filtering. Optimizing barrier materials significantly boosts transistor performance for advanced electronics.

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Optimized Fabrication Procedure for High-Quality Graphene-based Moir&#233; Superlattice Devices
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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Optimized Fabrication Procedure for High-Quality Graphene-based Moir&#233; Superlattice Devices
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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Nanoelectronics

Background:

  • Hot-electron transistors (HETs) are promising for high-frequency applications.
  • Graphene offers unique electronic properties for device fabrication.
  • Vertical device architectures can enable higher integration density.

Purpose of the Study:

  • To demonstrate and characterize vertical graphene-base hot-electron transistors (GB-HETs).
  • To investigate the impact of barrier materials and thicknesses on device performance.
  • To optimize GB-HETs for improved current gain and on-off ratio.

Main Methods:

  • Fabrication of GB-HETs with varying structures and material parameters.
  • Electrical characterization to measure current saturation and on-off ratio.
  • Systematic study of tunneling and filtering barrier effects on common-base current gain (α).

Main Results:

  • Achieved high current on-off ratio (>10^5) attributed to vertical hot electron transport and filtering.
  • Identified SiO2 thickness and HfO2 as filtering barrier as key optimization parameters.
  • Demonstrated over a 2-order of magnitude improvement in common-base current gain (α) with optimized barriers.

Conclusions:

  • Vertical GB-HETs exhibit excellent performance characteristics.
  • Material optimization, specifically SiO2 thickness and HfO2 filtering barrier, is crucial for enhancing device gain.
  • GB-HETs show significant potential for high-frequency, high-speed, and high-density integrated circuits.