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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...

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...

Energy Stored in a Capacitor

Energy Stored in a Capacitor

When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.

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...

Design Example: Capacitance Multiplier Circuit

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.

Energy Stored in a Capacitor: Problem Solving

Energy Stored in a Capacitor: Problem Solving

In 1749, Benjamin Franklin coined the word battery for a series of capacitors connected to store energy. Capacitors store electric potential energy that can be released over a short time. This property means capacitors have a wide range of applications.
Capacitor-discharge ignition is a type of ignition system commonly found in small engines where the energy released from a capacitor ignites an induction coil that, in turn, fires the spark plug.
To calculate the energy stored in a capacitor of...

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Related Experiment Video

Updated: Aug 17, 2025

Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors

Elaborate Control of Inkjet Printer for Fabrication of Chip-based Supercapacitors

Published on: November 30, 2021

Scalable Paper Supercapacitors for Printed Wearable Electronics.

Mehmet Girayhan Say¹, Calvin J Brett^2,3,4, Jesper Edberg⁵

¹Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-601 74Norrköping, Sweden.

ACS Applied Materials & Interfaces

|December 12, 2022

Summary

This summary is machine-generated.

We developed a spray-coating method for paper supercapacitors using PEDOT:PSS/CNF electrodes. This eco-friendly approach yields high-performance, flexible energy storage for wearable electronics.

Keywords:

GISAXS GIWAXS PEDOT:PSS nanocellulose spray coating supercapacitors wearable electronics

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Last Updated: Aug 17, 2025

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A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles

A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles

Published on: March 13, 2017

Area of Science:

Materials Science
Energy Storage
Sustainable Electronics

Background:

Printed paper-based electronics offer a sustainable solution for energy storage.
Flexible, low-cost infrastructure is needed for portable and wearable devices.

Purpose of the Study:

To demonstrate a scalable spray-coating method for fabricating paper supercapacitor electrodes.
To optimize electrode thickness and morphology for enhanced performance.

Main Methods:

Layer-by-layer spray deposition of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/cellulose nanofibril (CNF).
Morphological analysis using X-ray scattering.
Fabrication and testing of all-printed supercapacitors.

Main Results:

Spray-coated electrodes showed homogeneous films with reduced agglomeration compared to drop-casting.
Achieved an areal capacitance of 9.1 mF/cm² and a low equivalent series resistance (ESR) of 0.3 Ω.
Demonstrated a self-powered wearable wristband integrating a large-area supercapacitor with a solar cell.

Conclusions:

Spray-coating is a superior method for manufacturing high-quality paper-based electrodes.
The developed supercapacitors are suitable for powering electrochromic indicators and wearable devices.
Sequential coating/printing methods hold significant potential for scaling up printed wearables and self-sustaining systems.