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MOS Capacitor

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

Capacitor With A Dielectric

Capacitor With A Dielectric

Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...

Dielectric Polarization in a Capacitor

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...

Capacitors and Capacitance

Capacitors and Capacitance

A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...

Capacitors

Capacitors

Capacitors play a crucial role in car radios, where they filter and store frequencies to ensure clear signal reception. Essentially serving as energy storage devices, capacitors store energy within their electric field and are composed of two parallel conducting plates separated by a dielectric.
When a voltage source is connected to a capacitor, positive and negative charges accumulate on the opposite plates. This accumulation generates a potential difference that equals the product of the...

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Related Experiment Video

Updated: Sep 23, 2025

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Published on: April 12, 2018

Charge doping to flat AgF₂ monolayers in a chemical capacitor setup.

Daniel Jezierski¹, Adam Grzelak¹, Xiaoqiang Liu²

¹Center of New Technologies, University of Warsaw, 02089, Warsaw, Poland. a.grzelak@cent.uw.edu.pl.

Physical Chemistry Chemical Physics : PCCP

|May 17, 2022

Summary

Silver(II) fluoride monolayers show potential for high-temperature superconductivity. Electron doping allows fine-tuning of critical temperature (Tc) in these magnetic superconductors.

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Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds

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Last Updated: Sep 23, 2025

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Published on: April 12, 2018

Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance

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Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds

Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds

Published on: December 2, 2013

Area of Science:

Condensed Matter Physics
Materials Science
Quantum Chemistry

Background:

Flat monolayers of silver(II) fluoride (AgF2) are predicted to exhibit strong antiferromagnetic superexchange.
These materials hold potential for ambient pressure superconductivity when optimally doped.

Purpose of the Study:

To calculate the optimal doping level for superconductivity in AgF2 monolayers.
To investigate the feasibility of controlled doping using a chemical capacitor setup.
To explore the effects of electron versus hole doping on superconducting properties.

Main Methods:

Density Functional Theory (DFT) calculations were employed.
Simulations modeled a "chemical capacitor" setup for doping.
Analysis focused on electron doping effects and tuning of critical temperature (Tc).

Main Results:

Optimal doping for superconductivity in AgF2 monolayers is calculated to be 14% holes per formula unit.
Electron doping in AgF2 monolayers can be precisely controlled via the chemical capacitor setup.
Fine-tuning of doping levels allows access to underdoped and overdoped regimes, similar to Nd2CuO4.

Conclusions:

AgF2 monolayers can be engineered for tunable superconductivity through controlled electron doping.
The chemical capacitor method offers a viable route to achieving desired doping levels for high-Tc superconductivity.
Further research into AgF2-based superconductors could lead to materials with critical temperatures approaching 200 K.