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Related Concept Videos

Types of Semiconductors01:20

Types of Semiconductors

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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Semiconductors

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...
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Thermal and Photochemical Electrocyclic Reactions: Overview

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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Schottky Barriers
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Structure of Conjugated Dienes

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Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:

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Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
08:43

Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors

Published on: November 7, 2016

Thienoacene-based organic semiconductors.

Kazuo Takimiya1, Shoji Shinamura, Itaru Osaka

  • 1Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, Japan. ktakimi@hiroshima-u.ac.jp

Advanced Materials (Deerfield Beach, Fla.)
|August 16, 2011
PubMed
Summary

Thienoacenes, organic semiconductors in organic field-effect transistors (OFETs), show diverse properties despite similar structures. This review correlates thienoacene molecular and packing structures to their electronic properties for improved semiconductor design.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Solid-State Physics

Background:

  • Thienoacenes, ladder-type fused thiophene structures, are key organic semiconductors for organic field-effect transistors (OFETs).
  • Despite structural similarities, thienoacene-based OFETs exhibit varied performance characteristics.
  • Understanding structure-property relationships is crucial for advancing organic semiconductor technology.

Purpose of the Study:

  • To review and classify thienoacenes into four main structural classes.
  • To elucidate the molecular electronic structures of these thienoacene classes.
  • To correlate packing structures and solid-state electronic properties with carrier transport in OFETs.

Main Methods:

  • Classification of thienoacenes based on chemical structure.
  • Analysis of molecular electronic structures.
  • Correlation of packing structures with solid-state electronic properties and OFET device performance.

Main Results:

  • Identification of four distinct classes of thienoacenes.
  • Elucidation of structure-property relationships, linking molecular and packing structures to electronic behavior.
  • Demonstration of how solid-state packing influences carrier transport in OFETs.

Conclusions:

  • Thienoacene properties in OFETs are highly dependent on their molecular and solid-state packing structures.
  • This review provides insights into rational molecular design for superior organic semiconductors.
  • Future research should focus on tailoring thienoacene structures to optimize electronic properties for advanced OFET applications.