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Related Concept Videos

Semiconductors01:22

Semiconductors

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...
Types of Semiconductors01:20

Types of Semiconductors

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...
Field Effect Transistor01:29

Field Effect Transistor

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...
Bipolar Junction Transistor01:22

Bipolar Junction Transistor

Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational characteristics.
The structure...
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...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...

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Related Experiment Video

Updated: Jun 17, 2026

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
07:12

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

Published on: August 28, 2018

Two-Dimensional Semiconductors for Postsilicon Electronics: From Transistors to Integrated Circuits.

Yanglin Long1, Haozhe Wang1, Gangning Lou1

  • 1Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, School of Electronics, Peking University, Beijing100871, China.

ACS Nano
|June 16, 2026
PubMed
Summary
This summary is machine-generated.

Two-dimensional (2D) semiconductors offer a path beyond silicon limitations for advanced electronics. This review covers 2D field-effect transistors (FETs), their challenges, and integration into next-generation circuits.

Keywords:
2D integrated circuits2D transistors3D integrationCFETFinFETGAAFETcontact resistancegate dielectrictransistor scaling

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Last Updated: Jun 17, 2026

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Semiconductor Physics

Background:

  • Silicon technology faces fundamental physical bottlenecks limiting further scaling.
  • Two-dimensional (2D) semiconductors present unique advantages like atomic thickness and superior electrostatic control for next-generation electronics.

Purpose of the Study:

  • To systematically review progress and challenges in 2D material-based field-effect transistors (FETs).
  • To analyze device-level engineering, circuit integration, and future directions for 2D semiconductor electronics.

Main Methods:

  • Systematic review of recent research on 2D material-based FETs.
  • Analysis of critical challenges: contact resistance, gate dielectric integration, and dimensional scaling.
  • Survey of evolving transistor architectures (FinFET, GAAFET, CFET) and integrated circuits.

Main Results:

  • Identified key interface engineering strategies for high-performance 2D transistors.
  • Highlighted experimental milestones in 2D logic, memory, RF, and neuromorphic circuits.
  • Demonstrated progress in integrating 2D materials into complex systems like CPUs and AI hardware.

Conclusions:

  • 2D semiconductors show significant promise for post-silicon electronics, addressing current limitations.
  • Remaining challenges include optimizing contacts, dielectrics, and scaling for widespread adoption.
  • Future research should focus on overcoming these roadblocks for advanced electronic applications.