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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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.
Removing one hydrogen from the intervening CH2 group...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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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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Microscopic Evidence for Spatially Inhomogeneous Charge Trapping in Pentacene.

E M Muller1, J A Marohn2

  • 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853-2501, USA.

Advanced Materials (Deerfield Beach, Fla.)
|August 20, 2021
PubMed
Summary
This summary is machine-generated.

Charge traps in pentacene thin-film transistors are unevenly distributed, challenging the assumption that they are linked to grain boundaries. This study used electric force microscopy to map trap locations.

Keywords:
Charge trappingPentacenes

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Charge traps significantly impact the performance of organic thin-film transistors (OTFTs).
  • Previous research often assumed charge traps in polycrystalline organic semiconductors like pentacene are located at grain boundaries.
  • Understanding trap distribution is crucial for improving OTFT device efficiency and stability.

Purpose of the Study:

  • To investigate the spatial distribution of charge traps in polycrystalline pentacene thin films.
  • To determine if charge traps are associated with grain boundaries in pentacene OTFTs.
  • To provide a more accurate model for charge transport in pentacene-based devices.

Main Methods:

  • Utilized electric force microscopy (EFM) to image charge trap distribution.
  • Analyzed trap mapping below and above the transistor threshold voltage.
  • Examined trap distribution in polycrystalline pentacene thin-film transistors.

Main Results:

  • Charge traps in pentacene are distributed inhomogeneously.
  • The observed trap distribution does not correlate with grain boundaries.
  • Long-lived charge traps exhibit an unexpected spatial arrangement.

Conclusions:

  • The common assumption linking charge traps to grain boundaries in pentacene is not supported by this EFM study.
  • Inhomogeneous trap distribution, independent of grain boundaries, is a key factor in pentacene OTFT performance.
  • Further research is needed to elucidate the true origin and nature of these charge traps.