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Related Concept Videos

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...
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...
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...
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 Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...

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Updated: May 26, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
08:12

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

Single-layer MoS2 phototransistors.

Zongyou Yin1, Hai Li, Hong Li

  • 1School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.

ACS Nano
|December 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a new molybdenum disulfide (MoS2) phototransistor with excellent light sensitivity and fast switching speeds. This MoS2 device shows superior photoresponsivity, paving the way for advanced optoelectronics.

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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

Published on: August 28, 2018

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Molybdenum disulfide (MoS2) is a promising two-dimensional material with unique electronic and optical properties.
  • Phototransistors are essential components in optoelectronic devices for light detection and signal processing.

Purpose of the Study:

  • To fabricate and characterize a novel phototransistor utilizing mechanically exfoliated single-layer MoS2 nanosheets.
  • To investigate the light-induced electrical properties and performance of the MoS2 phototransistor.

Main Methods:

  • Fabrication of a phototransistor device using single-layer MoS2 nanosheets obtained via mechanical exfoliation.
  • Detailed investigation of photocurrent generation under varying optical power and constant voltage conditions.
  • Analysis of the switching dynamics (photocurrent generation and annihilation) and stability.

Main Results:

  • The MoS2 phototransistor demonstrated photocurrent solely dependent on illuminated optical power.
  • Achieved rapid photocurrent switching within approximately 50 milliseconds with good stability.
  • Exhibited superior photoresponsivity compared to graphene-based phototransistors.

Conclusions:

  • The single-layer MoS2 phototransistor shows significant potential for optoelectronic applications due to its excellent light control, fast switching, and high photoresponsivity.
  • This work highlights the suitability of MoS2 as a key material for developing next-generation multifunctional optoelectronic devices.