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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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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.
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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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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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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.
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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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Ferroelectrics-Integrated Two-Dimensional Devices toward Next-Generation Electronics.

Tengyu Jin1,2, Jingyu Mao2, Jing Gao2

  • 1Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, P. R. China.

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|September 13, 2022
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Summary
This summary is machine-generated.

Two-dimensional (2D) van der Waals (vdW) ferroelectrics offer unique surface-insensitive properties for advanced semiconductor devices. Their integration into 2D heterostructures and devices enables novel functionalities for next-generation electronics.

Keywords:
ferroelectricsfield-effect transistorsheterostructuresnegative capacitanceneuromorphic devicesnonvolatile memoriesprogrammable devicestwo-dimensional materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Ferroelectric materials are crucial for semiconductor technologies.
  • Two-dimensional (2D) van der Waals (vdW) ferroelectrics exhibit unique surface-insensitive properties.
  • Integrating ferroelectrics with 2D materials promises novel electronic functionalities.

Purpose of the Study:

  • To review fundamental properties of ferroelectrics compatible with 2D devices.
  • To critically examine recent advances in integrating ferroelectrics into 2D devices.
  • To discuss device architectures and working mechanisms for ferroelectric-based 2D electronics.

Main Methods:

  • Review of fundamental ferroelectric properties relevant to 2D integration.
  • Analysis of recent research on ferroelectric/2D material heterostructures.
  • Discussion of device types: tunnel junctions, diodes, and field-effect transistors.

Main Results:

  • Ferroelectric integration enables functional 2D devices like negative capacitance transistors, programmable devices, nonvolatile memories, and neuromorphic computing elements.
  • 2D vdW ferroelectrics are particularly emphasized for their unique properties.
  • Representative device architectures and mechanisms are discussed.

Conclusions:

  • Ferroelectric-integrated 2D devices offer significant potential for next-generation electronics.
  • Challenges remain in the commercial application of these devices.
  • Further research is needed to overcome integration and scalability hurdles.