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Area of Science:

  • Advanced molecular materials science
  • Supramolecular chemistry
  • Organic electronics

Background:

  • Conventional advanced materials combine multiple molecules for diverse properties.
  • Single molecules with multiple functionalities offer a more integrated approach.
  • Strong electronic coupling between functional subunits can yield novel properties.

Purpose of the Study:

  • To design and synthesize disc-like semiconducting organic molecules with strong dipolar side groups.
  • To investigate the supramolecular organization and resulting collective properties.
  • To explore the coupling between ferroelectric polarization and charge transport.

Main Methods:

  • Synthesis of disc-like organic molecules functionalized with dipolar side groups.
  • Characterization of supramolecular organization and polar order.
  • Measurement of charge transport properties and ferroelectric behavior.
  • Development of a model to explain experimental observations.

Main Results:

  • Supramolecular assembly leads to long-range polar order.
  • Collective ferroelectric behavior observed in the side groups.
  • Ferroelectric polarization couples with charge transport in semiconducting cores.
  • Bulk conductivity is switchable and rectifying.

Conclusions:

  • Single-molecule design enables combined functionalities in advanced materials.
  • Ferroelectric polarization can effectively modulate charge transport properties.
  • This approach offers a new paradigm for designing switchable electronic materials.