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Related Concept Videos

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...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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...
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...
P-N junction01:11

P-N junction

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...
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...
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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Related Experiment Video

Updated: May 15, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

On practical charge injection at the metal/organic semiconductor interface.

Akichika Kumatani1, Yun Li, Peter Darmawan

  • 1WPI center for Materials Nanoarchitectronics (WPI-MANA), National Institute of Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan. KUMATANI@wpi-aimr.tohoku.ac.jp

Scientific Reports
|January 8, 2013
PubMed
Summary

A novel double-layer electrode structure significantly reduces contact resistance in organic field-effect transistors. This breakthrough in organic electronics is achieved by utilizing a metal interlayer, enhancing charge injection efficiency.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Semiconductor Physics

Background:

  • Efficient charge injection is crucial for organic field-effect transistor (OFET) performance.
  • The metal-organic semiconductor interface presents a significant challenge for charge transport.

Purpose of the Study:

  • To develop and investigate a facile interface structure for improved charge injection.
  • To understand the role of electrode materials in contact resistance reduction.

Main Methods:

  • Fabrication of OFETs with a double-layer electrode structure.
  • Systematic investigation of contact metal dependence on interface properties.
  • Analysis of the relationship between electrode potential and contact resistance.

Main Results:

  • A few nanometers thick metal interlayer drastically reduces interface contact resistance.
  • Lower standard electrode potential of the interlayer metal, compared to the work function of contact metals, enhances performance.
  • Charge transfer is identified as the dominant mechanism at the interface.

Conclusions:

  • The developed double-layer electrode structure offers a practical solution for efficient charge injection.
  • Understanding electrode potential effects provides fundamental insights into organic device physics.
  • This work advances the development of high-performance all-organic electronic devices.