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Rotator side chains trigger cooperative transition for shape and function memory effect in organic semiconductors.

Hyunjoong Chung1, Dmytro Dudenko2, Fengjiao Zhang1

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Researchers discovered martensitic transitions in organic semiconductors, driven by rotating side chains. This finding enables shape and function memory effects in smart materials.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Crystallography

Background:

  • Martensitic transitions, known in metallurgy, involve cooperative atomic movement with low barriers and reversibility.
  • These transitions are seldom observed in molecular crystals, leaving their origin and mechanisms unexplored in this domain.

Purpose of the Study:

  • To report the discovery of martensitic transitions in organic semiconductor single crystals.
  • To elucidate the underlying mechanism and establish a molecular design rule for inducing these transitions in organic materials.

Main Methods:

  • In situ microscopy
  • Single-crystal X-ray diffraction
  • Raman spectroscopy
  • Nuclear magnetic resonance spectroscopy
  • Molecular simulations

Main Results:

  • Martensitic transition successfully induced in two distinct organic semiconductor single crystals.
  • Rotating bulky side chains identified as the key trigger for cooperative transition.
  • Demonstrated shape memory effect in single crystals and function memory effect in thin film transistors.

Conclusions:

  • Established a molecular design strategy for triggering martensitic transitions in organic semiconductors.
  • Highlights the potential for developing next-generation smart multifunctional materials based on this phenomenon.