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Related Concept Videos

Semiconductors01:22

Semiconductors

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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.
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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Carrier Transport01:21

Carrier Transport

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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.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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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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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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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Charge transport and structure in semimetallic polymers.

Sam Rudd1, Juan F Franco-Gonzalez2, Sandeep Kumar Singh2

  • 1Thin Film Coatings Group, Future Industries Institute, University of South Australia Mawson Lakes South Australia 5095 Australia.

Journal of Polymer Science. Part B, Polymer Physics
|December 16, 2017
PubMed
Summary

The choice of doping anion significantly impacts the electrical conductivity of poly(3,4-ethylenedioxythiophene) (PEDOT). Specific anions enhance charge carrier mobility in conducting polymers for electronics applications.

Keywords:
DFTDFT calculationsGIWAXSMD simulationsWAXScharge transportconducting polymersmolecular dynamics

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Condensed Matter Physics

Background:

  • Conducting polymers offer tunable electrical conductivity for low-cost electronics.
  • Poly(3,4-ethylenedioxythiophene) (PEDOT) is a semi-metallic conducting polymer with high conductivity.
  • Understanding structure-property relationships is crucial for optimizing polymer performance.

Purpose of the Study:

  • To investigate how different doping anions affect the electronic transport properties of PEDOT at high doping levels.
  • To correlate anion choice with structural modifications and charge carrier mobility.
  • To provide insights for fabricating advanced conducting polymer devices.

Main Methods:

  • Hall effect measurements to determine charge carrier mobility and conductivity.
  • Grazing Incidence Wide Angle X-ray Scattering (GIWAXS) for structural analysis.
  • Density Functional Theory (DFT) and Molecular Dynamics (MD) simulations for theoretical insights.

Main Results:

  • The choice of doping anion led to an order of magnitude enhancement in charge carrier mobility (>3 cm²/Vs).
  • Conductivities approaching 3000 S/cm were achieved under ambient conditions.
  • Anions were found to influence the stacking arrangement of PEDOT chains.

Conclusions:

  • Doping anion selection is a critical factor in optimizing PEDOT's electronic transport properties.
  • Structural modifications induced by anions directly impact charge carrier mobility.
  • This study provides a foundation for designing high-performance conducting polymer-based electronic devices.