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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...
Non-ohmic Devices00:51

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A diode...
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...
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...
MOSFET Amplifiers01:17

MOSFET Amplifiers

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...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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 current...

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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

Post-Moore two-dimensional integrated electronics for angstrom-nodes.

Zizhuo Shen1, Yihao Zheng1,2, Fansheng Peng1

  • 1Key Lab for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, School of Electronics, Peking University, Beijing 100871, China.

National Science Review
|July 1, 2026
PubMed
Summary
This summary is machine-generated.

Two-dimensional (2D) materials offer a path beyond silicon

Keywords:
angstrom-nodesnext-generation transistorspost-Moorescaling limitstwo-dimensional materials

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Silicon electronics face physical limits and high costs at angstrom-nanometer nodes.
  • Two-dimensional (2D) materials present an alternative due to atomic thickness and integration suitability.

Purpose of the Study:

  • To systematically review advances in integrated electronics based on 2D materials.
  • To highlight challenges and future directions for 2D electronic systems.

Main Methods:

  • Overview of wafer-scale synthesis and transfer techniques for 2D semiconductors.
  • Discussion of high-performance 2D transistor advancements (gate dielectrics, contacts, scaling).
  • Survey of circuit and system-level implementations (logic, memory, 3D integration).

Main Results:

  • Progress in wafer-scale synthesis and transfer of 2D materials.
  • Development of high-performance 2D transistors with optimized integration.
  • Exploration of 2D materials in logic, memory, and 3D monolithic integrated circuits.

Conclusions:

  • 2D materials are crucial for extending device scaling beyond silicon's limits.
  • Key challenges remain in realizing scalable, manufacturable, and low-power 2D electronic systems.
  • Future research should focus on addressing these challenges for angstrom-node electronics.