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Related Concept Videos

MOS Capacitor01:25

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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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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Related Experiment Video

Updated: Jan 4, 2026

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Native Void Space for Maximum Volumetric Capacity in Silicon-Based Anodes.

Su Jeong Yeom1, Cheolmin Lee1, Sujin Kang1

  • 1Department of Energy Engineering, School of Energy and Chemical Engineering , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Republic of Korea.

Nano Letters
|November 2, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed porous silicon anodes for high-energy lithium-ion batteries. This innovation addresses silicon

Keywords:
High-volumetric batteriesSi/graphite compositesin situ TEMnative void spacevolumetric capacity

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Volumetric energy density is crucial for high-energy batteries, yet improvement efforts are limited.
  • Silicon anodes offer high specific capacity for next-generation lithium-ion batteries.
  • Silicon's volume expansion during cycling restricts mass loading and limits volumetric capacity.

Purpose of the Study:

  • To develop a strategy for improving the volumetric capacity of silicon-based anodes.
  • To mitigate the volume expansion challenges associated with silicon anodes.
  • To enable higher silicon loading in anodes for enhanced battery performance.

Main Methods:

  • Templating porous silicon from earth-abundant minerals with native internal voids.
  • Utilizing in situ transmission electron microscopy for precise determination of silicon expansion rates.
  • Developing an analytical model to optimize silicon content in silicon/graphite composites.

Main Results:

  • Porous silicon effectively alleviates volumetric expansion during repeated battery cycles.
  • Achieved a silicon loading of 42%, significantly exceeding conventional limitations (13-14%).
  • The designed anode demonstrates a high volumetric capacity of 978 mAh cc⁻¹.

Conclusions:

  • Templated porous silicon from abundant minerals offers a viable solution for high volumetric capacity anodes.
  • Suppression of volume expansion through this method enables cost-effective battery fabrication.
  • This approach opens new avenues for developing advanced, high-performance lithium-ion batteries.