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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
Charging Conductors By Induction01:15

Charging Conductors By Induction

The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...

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Spray-Coated Melanin/PEDOT:PSS Films for Sustainable Organic Electrochemical Transistors
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Metallic conduction at organic charge-transfer interfaces.

Helena Alves1, Anna S Molinari, Hangxing Xie

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

Nature Materials
|June 17, 2008
PubMed
Summary

Researchers created highly conducting interfaces using organic semiconductor crystals. These interfaces exhibit metallic conductivity, paving the way for new electronic systems based on molecular charge transfer.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Organic Electronics

Background:

  • Electronic properties of solid interfaces can differ significantly from bulk materials.
  • Metallic conductivity and superconductivity have been observed at interfaces of transition-metal oxides.

Purpose of the Study:

  • Investigate interfaces between conjugated organic molecules, which are typically insulators.
  • Explore the potential for creating highly conducting interfaces with organic semiconductors.

Main Methods:

  • Assembled interfaces between crystals of conjugated organic molecules.
  • Measured electrical resistivity and temperature dependence of conductivity.

Main Results:

  • Achieved highly conducting interfaces with resistivity from 1 to 30 kΩ/sq.
  • Observed metallic temperature dependence of conductivity in the best samples.
  • Identified charge transfer between crystals at the molecular scale as the conduction mechanism.

Conclusions:

  • Demonstrated a new class of electronic systems based on conducting organic interfaces.
  • The simple interface assembly is applicable to a wide range of conjugated molecules.
  • These findings open avenues for novel organic electronic devices.