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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Band gap modulation in polythiophene and polypyrrole-based systems.

Thaneshwor P Kaloni1, Georg Schreckenbach1, Michael S Freund2

  • 1Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.

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This study explores modifying polythiophene and polypyrrole electronic properties. Substitutions and stacking significantly alter band gaps, offering tunable materials for potential applications.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Condensed Matter Physics

Background:

  • Polythiophene and polypyrrole are conductive polymers with tunable electronic properties.
  • Band gap engineering is crucial for developing advanced electronic materials.

Purpose of the Study:

  • Investigate structural and electronic properties of polythiophene and polypyrrole systems.
  • Explore band gap modulation via elemental substitution and bilayer formation.
  • Assess the experimental feasibility and stability of designed materials.

Main Methods:

  • First-principles calculations (PBE and B3LYP hybrid functionals).
  • Periodic and oligomer (molecular) models.
  • Binding energy and phonon calculations for stability analysis.

Main Results:

  • Elemental substitution (S by Se/Te in polythiophene, N by P/As in polypyrrole) is energetically favorable.
  • Bilayer formation (stacking) of polymers and derivatives linearly reduces the band gap.
  • A wide range of band gaps is achievable through these modifications.

Conclusions:

  • The investigated polythiophene and polypyrrole derivatives are experimentally realizable.
  • Substitution and stacking offer effective strategies for band gap engineering in conductive polymers.
  • The findings provide a pathway for designing novel organic electronic materials.