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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.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Design Example: Capacitance Multiplier Circuit01:20

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.
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Equivalent Capacitance01:19

Equivalent Capacitance

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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Updated: Jun 12, 2025

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
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Negative capacitance based on isomeric polythiophene in action.

Devendra Kumar1, Rudramani Tiwari1, Dipendra Kumar Verma1

  • 1Department of Chemistry, Center of Advanced Study, Institute of Science, Banaras Hindu University, Varanasi-221005, India. dr.skmoorthi@gmail.com.

Soft Matter
|September 24, 2024
PubMed
Summary
This summary is machine-generated.

By arranging positive and negative capacitance materials in series, this study achieved higher total capacitance in energy storage devices. This breakthrough utilizes negative capacitance technology for supercapacitors, paving the way for advanced organic energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Supercapacitors (SC) are crucial for energy storage.
  • Achieving higher capacitance often faces fundamental limitations.
  • Organic materials offer potential for novel energy storage solutions.

Purpose of the Study:

  • To investigate the effect of arranging positive and negative capacitance materials in series.
  • To explore the application of negative capacitance (NC) technology in supercapacitors.
  • To assess the feasibility of developing high-capacitance, all-organic energy storage devices.

Main Methods:

  • Fabrication of energy storage devices using isomeric polythiophene-based materials.
  • Series arrangement of positive and negative capacitance components.
  • Capacitance measurements and performance evaluation of supercapacitors.

Main Results:

  • A notable increase in total capacitance was achieved by arranging positive and negative capacitance materials in series.
  • Negative capacitance technology demonstrated potential to surpass conventional supercapacitor limits.
  • The study confirmed the feasibility of high-capacitance, all-organic energy storage.

Conclusions:

  • Series arrangement of isomeric polythiophene-based positive and negative capacitance materials enhances device capacitance.
  • Negative capacitance technology is a promising avenue for exceeding fundamental energy storage limits in supercapacitors.
  • All-organic energy storage devices with high capacitance are feasible, offering a sustainable alternative.