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Related Concept Videos

Semiconductors01:22

Semiconductors

1.6K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.6K
Types of Semiconductors01:20

Types of Semiconductors

1.5K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.1K
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...
1.1K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

4.1K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Updated: Feb 17, 2026

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Organic semiconductor crystals.

Chengliang Wang1, Huanli Dong, Lang Jiang

  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China. clwang@hust.edu.cn.

Chemical Society Reviews
|November 30, 2017
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Summary
This summary is machine-generated.

Organic semiconductor crystals offer intrinsic properties for high-performance electronics like transistors and LEDs. This review details their structure, charge transport, and device applications.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Organic Electronics

Background:

  • Organic semiconductors are key for flexible electronics (OFETs, OLEDs, OPVs).
  • Single crystals offer superior properties due to minimal defects and long-range order.
  • Understanding crystal properties is crucial for advancing organic electronic devices.

Purpose of the Study:

  • To provide a comprehensive overview of organic semiconductor crystals.
  • To detail molecular packing, morphology, and charge transport.
  • To discuss crystallization control and device physics in key applications.

Main Methods:

  • Literature review of organic semiconductor crystal research.
  • Analysis of molecular packing and morphology studies.
  • Examination of charge transport mechanisms and device performance data.

Main Results:

  • Organic semiconductor crystals exhibit unique charge transport properties.
  • Crystallization control is vital for high-quality crystals and device performance.
  • Structure-property relationships are elucidated through crystal studies.

Conclusions:

  • Organic semiconductor crystals are essential for understanding intrinsic properties.
  • Further research in crystallization and device physics will drive innovation.
  • This review summarizes the state-of-the-art and guides future research directions.