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MOS Capacitor01:25

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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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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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Published on: March 27, 2019

Pore size distribution and capacitance in microporous carbons.

Fritz Stoeckli1, Teresa A Centeno

  • 1Department of Physics, University of Neuchâtel, Neuchâtel, Switzerland. fritz.stoeckli@unine.ch

Physical Chemistry Chemical Physics : PCCP
|July 25, 2012
PubMed
Summary

Modelling reveals that microporous carbon pore size distribution has minimal impact on surface capacitance (C/S) within the 0.7 to 1.3 nm range. This confirms a consistent C/S of 0.09 ± 0.01 F m⁻² for typical carbons in tetraethylammonium tetrafluoroborate-AN electrolyte.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Physical Chemistry

Background:

  • Microporous carbons are crucial for electrochemical energy storage.
  • Understanding the relationship between pore structure and capacitance is vital for optimizing performance.
  • Surface-related capacitance (C/S) is a key parameter in evaluating electrode materials.

Purpose of the Study:

  • To investigate the influence of pore size distribution on the surface-related capacitance of microporous carbons.
  • To determine the range of C/S values for typical carbons within a specific pore size range.
  • To validate the consistency of C/S in tetraethylammonium tetrafluoroborate-acetonitrile (TEABF₄-AN) electrolyte.

Main Methods:

  • Non-local density functional theory (NLDFT) modelling was employed to determine pore size distributions.
  • Surface-related capacitance (C/S) was analyzed across various microporous carbon samples.
  • Electrochemical measurements were conducted using TEABF₄-AN electrolyte.

Main Results:

  • NLDFT modelling indicated that pore size distribution variations between 0.7 and 1.3 nm have a limited effect on C/S.
  • The study found relatively small variations in C/S within this pore size range.
  • A consistent C/S value of 0.09 ± 0.01 F m⁻² was observed for typical carbons, including carbide-based samples.

Conclusions:

  • The pore size distribution of microporous carbons, as determined by NLDFT, does not significantly alter surface-related capacitance in the 0.7–1.3 nm range.
  • The findings reinforce the established C/S value for typical carbons in TEABF₄-AN electrolyte.
  • This suggests that other factors may play a more dominant role in capacitance beyond this specific pore size range.