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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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P-N junction01:11

P-N junction

997
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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Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

24.1K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
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Ion-Assisted Resonant Injection and Charge Storage in Carbon-Based Molecular Junctions.

Mustafa Supur1, Shailendra K Saxena1, Richard L McCreery1

  • 1Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2R3, Canada.

Journal of the American Chemical Society
|June 23, 2020
PubMed
Summary
This summary is machine-generated.

This study demonstrates enhanced charge storage in a carbon/tetraphenylporphyrin junction using mobile ions from lithium fluoride (LiF) in acetonitrile vapor. This method significantly boosts reversible charge storage capacity compared to vacuum conditions.

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Area of Science:

  • Organic electronics
  • Materials science
  • Electrochemistry

Background:

  • Organic semiconductors offer potential for electronic devices.
  • Charge storage mechanisms in organic junctions are crucial for applications.
  • Ionic screening plays a role in charge transfer dynamics.

Purpose of the Study:

  • To investigate resonant charge injection and storage in a novel organic junction.
  • To explore the effect of mobile ions on charge storage enhancement.
  • To analyze the performance of a carbon/tetraphenylporphyrin/LiF/carbon junction.

Main Methods:

  • Fabrication of a large-area carbon/tetraphenylporphyrin (TPP)/LiF/carbon junction.
  • Utilizing acetonitrile (ACN) vapor to provide mobile ions.
  • In situ photocurrent measurements for monitoring charge injection.
  • Cyclic voltammetry (IV cycling) to analyze charge storage.

Main Results:

  • Resonant electron transfer into TPP molecules observed at <+1 V due to ionic screening.
  • Formation of TPP radical cation monitored via photocurrent.
  • Persistent faradaic current peaks observed in ACN vapor, indicating charge storage.
  • Reversible charge storage enhanced by a factor of 78 compared to vacuum.

Conclusions:

  • Mobile ions in organic junctions significantly enhance reversible charge storage.
  • Ionic screening is key to enabling resonant charge injection in such devices.
  • The TPP/LiF/carbon junction shows promise for efficient charge storage applications.