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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

880
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...
880

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Micro-Cup Architecture for Printing and Coating Asymmetric 2d-Material-Based Solid-State Supercapacitors.

Chuanfang John Zhang1,2, René Schneider2, Mohammad Jafarpour2,3

  • 1College of Materials Science & Engineering, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 20, 2023
PubMed
Summary

Researchers developed a novel "cup & core" micro-supercapacitor (MSC) architecture for high energy density. This design enhances volumetric capacitance and reduces time constant, outperforming traditional flat MSCs for miniaturized electronics.

Keywords:
MXeneconductive inksgraphenemicrosupercapacitor (MSC)screen printing

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Micro-supercapacitors (MSCs) are crucial for powering miniaturized electronics.
  • Current MSC research often uses planar interdigitated symmetric electrode designs.
  • There is a need for advanced architectures to improve energy density and performance.

Purpose of the Study:

  • To introduce a novel "cup & core" device architecture for micro-supercapacitors.
  • To enable the printing of asymmetric MSC devices without precise electrode alignment.
  • To enhance the energy density and electrochemical performance of MSCs.

Main Methods:

  • Fabrication of a "cup & core" architecture using laser-ablated or screen-printed graphene bottom electrodes.
  • Spray-deposition of a quasi-solid-state ionic liquid electrolyte onto graphene micro-cups.
  • Spray-coating of MXene inks as the top electrode material to fill the cup structure.

Main Results:

  • The "cup & core" architecture successfully created asymmetric micro-supercapacitors.
  • Volumetric capacitance significantly increased compared to flat reference devices.
  • Time constant decreased by 58%, indicating improved charge-discharge rates.
  • Achieved high energy density of 3.99 µWh cm⁻².

Conclusions:

  • The novel "cup & core" architecture offers a promising approach for high-performance MSCs.
  • This design integrates benefits of interdigitated and sandwich geometries for efficient ion diffusion.
  • The developed MSCs demonstrate superior energy density compared to existing graphene and MXene-based MSCs.