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Related Concept Videos

Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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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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Types of Semiconductors01:20

Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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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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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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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
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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From Planar to 3D: The Evolution of Complementary Field-Effect Transistor for Next-Generation Semiconductor Nodes.

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Summary

Complementary Field-Effect Transistors (CFETs) enable 3D integration for Moore's Law extension. This review details fabrication methods, van der Waals materials, and co-design for advanced semiconductor technology.

Keywords:
3D integrationcomplementary field‐effect transistorsmonolithic and sequential integrationoxide semiconductorsvan der waals materials

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Area of Science:

  • Semiconductor Device Physics
  • Materials Science
  • Nanotechnology

Background:

  • Moore's Law scaling faces limitations with 2D architectures.
  • Complementary Field-Effect Transistors (CFETs) offer a path to 3D integration.
  • A comprehensive review of CFET advancements is needed.

Purpose of the Study:

  • To review CFET fabrication methodologies and integration approaches.
  • To highlight the role of van der Waals materials in CFETs.
  • To discuss strategies for overcoming key CFET challenges and explore co-design principles.

Main Methods:

  • Comparative analysis of Monolithic and Sequential CFET integration.
  • Focus on thermal management, process complexity, and material compatibility.
  • Examination of layered van der Waals materials for thermal and gate control benefits.

Main Results:

  • Layered van der Waals materials are crucial for thermal management and gate control in CFETs.
  • Strategies for balanced electrical characteristics, thermal optimization, and parasitic capacitance reduction are discussed.
  • CFETs show potential in logic, memory, and computing-in-memory applications.

Conclusions:

  • Continued innovation in material-processing-structure co-design is essential for CFET technology advancement.
  • CFETs represent a critical step towards future semiconductor technology frontiers.
  • This review provides a forward-looking perspective on CFET development.