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Related Concept Videos

Field Effect Transistor01:29

Field Effect Transistor

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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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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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MOSFET01:16

MOSFET

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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.
In an n-MOSFET, the structure includes n-type source and drain...
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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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Biasing of FET01:22

Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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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.
Schottky Barriers
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Toward High-Performance p-Type Two-Dimensional Field Effect Transistors: Contact Engineering, Scaling, and Doping.

Aaryan Oberoi1, Ying Han1, Sergei P Stepanoff2,3

  • 1Department of Engineering Science and Mechanics, Penn State University, University Park, Pennsylvania 16802, United States.

ACS Nano
|October 9, 2023
PubMed
Summary

High-performance p-type field-effect transistors (FETs) using tungsten diselenide (WSe2) were developed by optimizing contacts, scaling channel length, and employing monolayer doping. This breakthrough addresses a key challenge in two-dimensional (2D) electronics.

Keywords:
2D materialsWSe2p-type dopingscalingstraintransistors

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) transition-metal dichalcogenides (TMDs) like MoS2 and WS2 show promise for electronic devices, but p-type field-effect transistors (FETs) lag in performance.
  • Existing p-type 2D FETs do not meet the stringent requirements of the International Roadmap for Devices and Systems (IRDS).

Purpose of the Study:

  • To achieve high-performance p-type FETs using synthetic WSe2.
  • To overcome the limitations in performance of current p-type 2D FETs.

Main Methods:

  • A multi-faceted approach involving contact engineering with palladium (Pd), channel length (Lch) scaling down to ~20 nm, and monolayer doping using tungsten oxyselenide (WOSe2).
  • Electrical measurements, atomistic imaging, and rigorous analysis to identify optimal contact metals and doping strategies.
  • Utilizing self-limiting oxidation of bilayer WSe2 to create monolayer WOSe2 for p-type doping.

Main Results:

  • Palladium (Pd) identified as a superior contact metal for WSe2, enhancing epitaxy, grain size, and compressive strain, leading to lower Schottky barrier height.
  • ON-state performance improved ~10x by scaling Lch, but ultrascaled FETs became contact-limited.
  • Monolayer WOSe2 doping resulted in a ~5x ON-state performance boost and a ~9x reduction in contact resistance.
  • Achieved a median ON-state current of ~10 μA/μm for ultrascaled, doped p-type WSe2 FETs with Pd contacts.
  • Demonstrated the applicability of the monolayer doping strategy to other 2D materials like MoS2, MoTe2, and MoSe2.

Conclusions:

  • A combination of contact engineering, channel length scaling, and monolayer doping is effective for creating high-performance p-type WSe2 FETs.
  • The developed techniques significantly improve ON-state performance and reduce contact resistance in 2D FETs.
  • The monolayer doping strategy shows broad applicability for enhancing various 2D materials for electronic applications.