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Types of Semiconductors01:20

Types of Semiconductors

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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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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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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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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Thiophene-Based Organic Semiconductors.

Gulsen Turkoglu1, M Emin Cinar1, Turan Ozturk2,3

  • 1Istanbul Technical University, Department of Chemistry, Istanbul, 34469, Turkey.

Topics in Current Chemistry (Cham)
|October 25, 2017
PubMed
Summary

Thiophene-based organic semiconductors offer diverse properties for advanced electronics. Understanding molecular interactions and solid-state packing is key to designing high-performance materials for organic photovoltaics and transistors.

Keywords:
Fused ThiophenesOrganic field-effect transistors (OFETs)Organic light emitting diodes (OLEDs)Organic photovoltaics (OPVs)Organic semiconductorsThiophene based polymersThiophenes

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Area of Science:

  • Material Chemistry
  • Organic Electronics
  • Polymer Science

Background:

  • Thiophene-based π-conjugated organic small molecules and polymers are crucial for organic semiconductors.
  • Diverse properties are observed despite similar molecular structures.
  • High-performance material design necessitates understanding molecular interactions and solid-state packing.

Purpose of the Study:

  • To classify thiophene-based organic semiconductors based on chemical structures.
  • To explore structure-property relationships in these materials.
  • To review their potential applications in organic electronics.

Main Methods:

  • Classification of materials by chemical structure.
  • Analysis of structure-property relationships.
  • Review of existing literature on applications.

Main Results:

  • Thiophene-based semiconductors exhibit varied properties influenced by molecular factors.
  • Key factors include inter- and intra-molecular interactions and solid-state packing.
  • These materials show promise for organic photovoltaics (OPVs), organic field-effect transistors (OFETs), and organic light-emitting diodes (OLEDs).

Conclusions:

  • A systematic classification and structure-property analysis is essential for advancing thiophene-based organic semiconductors.
  • Further research into molecular interactions and packing can lead to optimized material performance.
  • These materials hold significant potential for next-generation organic electronic devices.