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Related Concept Videos

MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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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.
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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.
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MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

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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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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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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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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Updated: Nov 18, 2025

Fabrication of a Solution-gated Indium-Tin-Oxide-based One-piece Transistor Enabling Sensitive Biosensing
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High-performance ambipolar MoS2transistor enabled by indium edge contacts.

Hai Yen Le Thi1, Muhammad Atif Khan2, A Venkatesan3

  • 1Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea.

Nanotechnology
|February 8, 2021
PubMed
Summary

Researchers developed a new method using indium metal contacts to improve electronic devices made from molybdenum disulfide (MoS2) and hexagonal boron nitride. This overcomes high contact resistance, enabling better performance for flexible electronics.

Keywords:
Schottky barrier heightcontact resistanceedge contactmolybdenum sulphidetransition metal dichalcogenides

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • High contact resistance in 2D heterostructures, particularly with molybdenum disulfide (MoS2), hinders the development of advanced nanoelectronic devices like field-effect transistors.
  • Effective electrical contact integration is crucial for realizing the full potential of 2D materials in electronics.

Purpose of the Study:

  • To demonstrate the efficacy of 1D indium metal contacts for encapsulated MoS2/hexagonal boron nitride heterostructures.
  • To address the challenge of high contact resistance in MoS2-based electronic devices.
  • To explore the potential for creating high-performance, air-stable electronic devices.

Main Methods:

  • Fabrication of 2D heterostructures using fully encapsulated MoS2 within hexagonal boron nitride.
  • Integration of 1D indium metal for electrical contacts.
  • Electrical characterization including transport measurements and temperature-dependent analysis.
  • Analysis of charge transport mechanisms and Schottky barrier height calculation.

Main Results:

  • Demonstrated ambipolar transport in the fabricated devices.
  • Achieved high on/off ratios: 10^2 for holes and 10^7 for electrons.
  • Measured high field-effect mobility of 40.7 cm^2 V^-1 s^-1 at liquid nitrogen temperature.
  • Characterized interface charge transport and determined Schottky barrier height.

Conclusions:

  • 1D indium metal contacts significantly reduce contact resistance in encapsulated MoS2 heterostructures.
  • The developed devices show excellent electrical performance, suitable for advanced nanoelectronic applications.
  • These findings pave the way for air-stable, large-scale fabrication of flexible, transparent, and wearable electronic devices.