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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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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.
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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Structural and Dynamic Disorder, Not Ionic Trapping, Controls Charge Transport in Highly Doped Conducting Polymers.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Organic Electronics

Background:

  • Doped organic semiconductors are crucial for advanced devices like thermoelectrics and neuromorphic computing.
  • Current understanding attributes low conductivity primarily to charge trapping by dopant counterions.

Purpose of the Study:

  • To investigate the primary factors limiting electrical conductivity in doped organic semiconductors.
  • To challenge the prevailing assumption that Coulomb potentials of dopant counterions are the main cause of low conductivity.

Main Methods:

  • Utilized a novel ion-exchange doping technique to create highly doped organic semiconductor films.
  • Characterized carrier density, electrical conductivity, and paracrystalline disorder across various polymer-ion combinations.
  • Developed and applied a theoretical model based on transient localization theory, validated by atomistic calculations.

Main Results:

  • Electrical conductivity showed a strong correlation with paracrystalline disorder.
  • Conductivity exhibited a poor correlation with the size and shape of dopant counterions.
  • Theoretical calculations aligned excellently with experimental findings.

Conclusions:

  • Coulomb traps from dopant counterions do not significantly limit charge transport in these materials.
  • Paracrystalline disorder is the dominant factor governing electrical conductivity in highly doped organic semiconductors.
  • Findings suggest new avenues for enhancing conductivity by managing material disorder.