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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.
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...
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MOSFET01:16

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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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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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MOSFET: Depletion Mode01:20

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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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Related Experiment Video

Updated: Aug 29, 2025

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Edge-Contact MoS2 Transistors Fabricated Using Thermal Scanning Probe Lithography.

Ana Conde-Rubio1, Xia Liu1, Giovanni Boero1

  • 1Microsystems Laboratory, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

ACS Applied Materials & Interfaces
|September 7, 2022
PubMed
Summary

Thermal scanning probe lithography (t-SPL) gently fabricates molybdenum disulfide (MoS2) field-effect transistors (FETs). This novel method avoids electron damage, achieving high on/off ratios for advanced 2D semiconductor devices.

Keywords:
2D materialsFETMoS2TMDCsedge contactlithographythermal scanning probe

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Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Semiconductor Device Fabrication

Background:

  • Two-dimensional materials (2DMs), especially 2D semiconductors, are crucial for next-generation electronics.
  • Conventional fabrication methods like electron beam lithography can damage delicate 2DMs, degrading their properties.
  • Gentle fabrication techniques are needed to preserve the integrity of 2DMs during device integration.

Purpose of the Study:

  • To demonstrate the use of thermal scanning probe lithography (t-SPL) for fabricating molybdenum disulfide (MoS2)-based field-effect transistors (FETs).
  • To specifically showcase t-SPL for creating edge-contact MoS2 FETs, a novel application.
  • To achieve high-performance characteristics in MoS2 FETs fabricated with a non-damaging lithography technique.

Main Methods:

  • Utilized thermal scanning probe lithography (t-SPL) for patterning and Ar+ milling for etching the MoS2.
  • Integrated etching and metal deposition steps within a single vacuum process to prevent atmospheric contamination.
  • Fabricated edge-contact MoS2 FETs using a combination of hot-tip patterning and Ar+ milling.

Main Results:

  • Successfully fabricated functional edge-contact MoS2 FETs using the developed t-SPL process.
  • Achieved high on/off ratios of up to 10^8 at room temperature in air.
  • Observed even higher on/off ratios, reaching 10^9 in vacuum, comparable to state-of-the-art devices.

Conclusions:

  • Thermal scanning probe lithography is a viable and gentle method for fabricating high-performance 2D semiconductor devices like MoS2 FETs.
  • The t-SPL technique, combined with in-situ processing, effectively preserves the quality of MoS2, leading to excellent device performance.
  • This approach offers a promising alternative for the scalable and reliable manufacturing of advanced 2D electronic devices.