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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...

Equivalent Capacitance

Equivalent Capacitance

Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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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...

Design Example: Capacitance Multiplier Circuit

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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.

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...

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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.
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

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Published on: January 7, 2022

Ion accumulation-induced capacitance elevation in a microporous graphene-based supercapacitor.

Bhaskar Pattanayak^1,2, Phuoc-Anh Le³, Debashis Panda^1,2

¹Department of Electrical Engineering and Computer Science, National Yang Ming Chiao Tung University Hsinchu City 30010 Taiwan.

|October 24, 2022

Summary

Researchers developed advanced porous 3D graphene supercapacitors using pyrolysis. These lightweight few-layer graphene (FLG) electrodes achieve high capacitance and energy density, showing promise for future energy storage technologies.

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Supercapacitors are crucial for next-generation energy technologies.
Developing high-performance, lightweight electrode materials is essential.
Porous graphene offers a promising platform due to its high surface area.

Purpose of the Study:

To synthesize and characterize a novel porous 3D graphene material for supercapacitor applications.
To investigate the electrochemical performance of graphene-based electrodes in various KOH electrolyte concentrations.
To evaluate the performance of a solid-state supercapacitor device fabricated with the synthesized graphene.

Main Methods:

Pyrolysis method for synthesizing few-layer graphene (FLG).
Characterization of graphene's morphology, surface area (2266 m² g⁻¹), and micropore size distribution (0.85–1.9 nm).
Electrochemical testing of graphene electrodes in KOH electrolytes and fabrication of a solid-state supercapacitor.

Main Results:

The synthesized FLG exhibits an ultra-high surface area with a significant contribution from 1.02 nm micropores.
A specific capacitance of 540 F g⁻¹ was achieved using 1 M KOH electrolyte, close to the theoretical limit.
The solid-state supercapacitor demonstrated high energy (18 Wh kg⁻¹) and power densities (10.2 kW kg⁻¹) with 100% coulombic efficiency over 6000 cycles.

Conclusions:

The defect-induced porous 3D graphene is a highly effective electrode material for supercapacitors.
The achieved electrochemical performance highlights the potential for advanced energy storage solutions.
The developed supercapacitor exhibits excellent stability and efficiency, suitable for practical applications.