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MOS Capacitor

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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.
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Hole defects and nitrogen doping in graphene: implication for supercapacitor applications.

Gaixia Luo¹, Lizhao Liu, Junfeng Zhang

¹Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology , Dalian 116024, China.

ACS Applied Materials & Interfaces

|October 19, 2013

Summary

Nitrogen-doped porous graphene with pyridinic-like holes offers a promising solution for high-performance supercapacitors. These materials balance high energy storage capacity with fast charge/discharge rates, enhancing energy storage devices.

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

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Area of Science:

Materials Science
Electrochemistry
Computational Physics

Background:

Supercapacitors face challenges in simultaneously achieving high energy capacity and fast charge/discharge rates.
Porous graphene is a promising electrode material due to its large surface area.

Purpose of the Study:

To explore the properties of graphene sheets with hole defects and nitrogen doping for supercapacitor applications.
To investigate the impact of hole geometry and nitrogen doping on electrochemical performance.

Main Methods:

First-principles calculations were employed to study graphene properties.
Non-equilibrium Green's function technique was used to analyze electrical conductance.
Formation energies, mechanical properties, and diffusion behaviors were investigated.

Main Results:

Graphene with pyridinic-like holes, especially hexagonal holes, is easily nitrogen-doped and retains excellent mechanical properties.
Porous graphene electrodes with moderate hole diameters (4.2-10 Å) improve electrolyte access and rate capability.
Nitrogen doping enhances pseudocapacitance through charge accumulation.

Conclusions:

Nitrogen-doped graphene with pyridinic-like holes demonstrates significant potential for high-performance supercapacitor energy storage.
These materials offer a pathway to overcome limitations in current supercapacitor technology.