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Related Concept Videos

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...
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...
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...
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...
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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Related Experiment Video

Updated: May 22, 2026

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
08:50

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Hysteresis in single-layer MoS2 field effect transistors.

Dattatray J Late1, Bin Liu, H S S Ramakrishna Matte

  • 1Department of Materials Science and Engineering and International Institute of Nanotechnology, Northwestern University, Evanston, Illinois 60208, USA.

ACS Nano
|May 15, 2012
PubMed
Summary
This summary is machine-generated.

Hysteresis in molybdenum disulfide (MoS2) field-effect transistors is caused by moisture absorption, exacerbated by photosensitivity. Encapsulation with silicon nitride effectively minimizes hysteresis and enhances device mobility.

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Published on: December 5, 2015

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ultrathin molybdenum disulfide (MoS2) field-effect transistors (FETs) show promise for advanced electronics.
  • MoS2 devices exhibit significant hysteresis and transient behaviors under ambient conditions, hindering their practical application.

Purpose of the Study:

  • To investigate the origin of hysteretic and transient behaviors in MoS2 FETs.
  • To identify methods for mitigating these undesirable effects and improving device performance.

Main Methods:

  • Fabrication and characterization of MoS2 FETs.
  • Investigation of device behavior under varying environmental conditions.
  • Implementation of silicon nitride encapsulation using plasma-enhanced chemical vapor deposition (PECVD).

Main Results:

  • Hysteresis in MoS2 FETs is primarily attributed to surface moisture absorption, amplified by the material's high photosensitivity.
  • Uniform encapsulation with silicon nitride significantly reduces hysteresis.
  • Device mobility is enhanced by over an order of magnitude after encapsulation.

Conclusions:

  • Moisture absorption is the dominant factor causing hysteresis in ambient MoS2 FETs.
  • Silicon nitride encapsulation is a viable strategy to stabilize MoS2 devices and improve their electronic performance.
  • These findings pave the way for more reliable and efficient MoS2-based electronic devices.