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Electrical doping in organic semiconductors differs between polymers and oligomers. For quaterthiophene oligomers, co-crystallites, not individual molecules, act as dopants by creating new electronic states.

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Area of Science:

  • Organic electronics
  • Materials science
  • Solid-state physics

Background:

  • Ground-state integer charge transfer is the established mechanism for molecular electrical doping in conjugated polymers and oligomers.
  • This study investigates alternative doping mechanisms in organic semiconductors.

Purpose of the Study:

  • To contrast the electrical doping mechanisms in polythiophene and quaterthiophene oligomers.
  • To elucidate the role of intermolecular interactions in oligomer doping.

Main Methods:

  • Complementary experimental techniques (e.g., conductivity measurements, spectroscopy) were employed.
  • Theoretical calculations supported the experimental observations.
  • Comparison between a polythiophene and a quaterthiophene oligomer was performed.

Main Results:

  • Polythiophene exhibits integer charge transfer upon p-doping, localized to the backbone.
  • Quaterthiophene oligomers show only partial charge transfer.
  • Intermolecular frontier-orbital hybridization in mixed-stack co-crystallites creates new electronic states within the energy gap of the oligomer matrix.

Conclusions:

  • Co-crystallites, rather than individual dopant molecules, are the active doping entities in quaterthiophene oligomers.
  • The emergence of new electronic states via hybridization drives conductivity in doped oligomers.
  • This challenges the conventional understanding of molecular doping in organic semiconductors.