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Nanostructured donor-acceptor self assembly with improved photoconductivity.

B Saibal1, A Z Ashar, R Nandini Devi

  • 1Polymer Science and Engineering Division, ‡Catalysis & Inorganic Chemistry Division, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India.

ACS Applied Materials & Interfaces
|October 7, 2014
PubMed
Summary

Researchers created novel nanostructured donor-acceptor assemblies using perylenebisimide and oligo(p-phenylenevinylene) derivatives. Polymerization of these assemblies significantly improved charge transport and photoconductivity, offering a versatile route to advanced semiconductor materials.

Keywords:
donor−acceptorhydrogen bondingoligo(p-phenylenevinylene)perylenebisimidephotoconductivitysupramolecular polymeric nanostructures

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Electronics

Background:

  • Development of advanced organic semiconductor materials is crucial for next-generation electronics.
  • Supramolecular self-assembly offers a powerful strategy for organizing functional molecules into ordered nanostructures.
  • Donor-acceptor systems are essential for efficient charge generation and transport in organic electronic devices.

Purpose of the Study:

  • To synthesize and characterize novel nanostructured supramolecular donor-acceptor assemblies.
  • To investigate the effect of polymerization on the self-assembly and electronic properties of these complexes.
  • To explore the potential of these materials for improved charge transport and photoconductivity.

Main Methods:

  • Complexation of unsymmetrical N-substituted pyridine functionalized perylenebisimide (UPBI-Py) with oligo(p-phenylenevinylene) (OPVM-OH).
  • Polymerization of the supramolecular complex via irradiation in the presence of a photoinitiator.
  • Characterization using fluorescence emission spectroscopy and wide-angle X-ray diffraction (WXRD).
  • Evaluation of electronic properties including space charge limited current (SCLC) and photoconductivity.

Main Results:

  • Formation of well-defined supramolecular polymeric nanostructures from [UPBI-Py (OPVM-OH)]1.0 complex.
  • Polymerization induced significant changes in OPV emission from aggregate to monomeric form.
  • WXRD confirmed distinct structural changes upon complex formation, unlike physical mixtures.
  • Uniform lamellar nanostructures (<10 nm) observed in thin films of both complex and polymer.
  • The supramolecular polymer exhibited enhanced bulk mobility (order of magnitude higher) and photoconductivity compared to pristine UPBI-Py.

Conclusions:

  • A versatile method for creating spatially organized n- and p-type semiconductor materials was demonstrated.
  • Supramolecular polymerization of donor-acceptor assemblies leads to improved charge transport properties.
  • These findings pave the way for developing high-performance organic electronic devices with enhanced photocurrent response.