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Related Concept Videos

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...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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...
Characteristics of MOSFET01:17

Characteristics of MOSFET

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 quicker...
MOSFET: Depletion Mode01:20

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.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...
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...

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

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

Published on: July 24, 2015

Graphene gate electrode for MOS structure-based electronic devices.

Jong Kyung Park1, Seung Min Song, Jeong Hun Mun

  • 1Department of Electrical Engineering, KAIST, 335 Gwahak-ro, Yuseong-gu, Daejeon, Korea, 305-701.

Nano Letters
|November 9, 2011
PubMed
Summary
This summary is machine-generated.

Graphene gate electrodes significantly enhance the reliability and performance of high-κ gate dielectrics in electronic devices. This breakthrough improves charge-trap flash memory, offering superior data retention and programming capabilities.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Gate dielectric reliability is crucial for advanced electronic devices, particularly nonvolatile memory.
  • Mechanical stress often degrades high-κ gate dielectrics, limiting device performance and lifespan.
  • Current charge-trap flash (CTF) memory faces challenges in data retention and program/erase efficiency.

Purpose of the Study:

  • To investigate the use of monolayer graphene as a gate electrode to improve gate dielectric reliability.
  • To assess the impact of graphene gate electrodes on the performance of nonvolatile Flash memory devices.
  • To explore the potential of graphene in next-generation MOS-based electronic devices.

Main Methods:

  • Fabrication of high-κ gate dielectric structures with monolayer graphene gate electrodes.
  • Characterization of gate dielectric reliability under mechanical stress.
  • Evaluation of nonvolatile Flash memory devices (CTF) incorporating graphene gate electrodes.
  • Analysis of quantum mechanical tunneling currents and device performance metrics.

Main Results:

  • Monolayer graphene gate electrodes effectively eliminate mechanical-stress-induced gate dielectric degradation.
  • Graphene's high work function reduces quantum mechanical tunneling current.
  • CTF memory devices with graphene electrodes exhibit superior data retention and program/erase performance compared to conventional devices.
  • Demonstrated a quantum leap in gate dielectric reliability.

Conclusions:

  • Graphene is a highly promising material for advanced gate electrodes, significantly enhancing dielectric reliability.
  • The integration of graphene gate electrodes offers a pathway to overcome current limitations in nonvolatile memory technologies.
  • This technology has broad implications for high-performance, mass-producible electronic devices based on MOS structures.