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Improved Transistor Performance by Modulating Molecular Packing with Donor and Acceptor Moieties.

Ze-Fan Yao1, Han-Yu Liu1, Zi-Yuan Wang1

  • 1Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center of Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.

Chemistry, an Asian Journal
|January 19, 2019
PubMed
Summary

Researchers developed new organic conjugated materials by tuning donor-acceptor interactions. This modulation shifted molecular packing, enhancing electron mobility in single-crystal transistors to 3.29 cm2 V-1 s-1.

Keywords:
conjugationcrystal structure predictiondensity functional calculationsdonor-acceptor systemsorganic field-effect transistors

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Area of Science:

  • Organic electronics
  • Materials science
  • Supramolecular chemistry

Background:

  • Developing novel organic conjugated materials is crucial for advanced electronics.
  • Understanding donor-acceptor interactions at the molecular level is key but underexplored.
  • Molecular design strategies are needed to control material properties.

Purpose of the Study:

  • To investigate the impact of donor-acceptor interactions on molecular packing and charge transport.
  • To design and synthesize small molecules with tunable electronic properties.
  • To correlate molecular structure with enhanced electron mobility in organic field-effect transistors.

Main Methods:

  • Synthesis of three small molecules with varying donor unit amounts.
  • Theoretical calculations to determine electronic properties, specifically lowest unoccupied molecular orbital (LUMO) levels.
  • Crystal structure prediction to evaluate molecular packing modes.
  • Fabrication and characterization of single-crystal field-effect transistors.

Main Results:

  • The lowest unoccupied molecular orbital (LUMO) levels of the synthesized molecules were found to be nearly identical.
  • Molecular packing transitioned from 1D slipped stacking to 2D brick-like layers due to donor-acceptor interactions.
  • A significant increase in electron mobility was observed, reaching 3.29 cm2 V-1 s-1 in single-crystal transistors.
  • The 2D molecular packing facilitated an effective charge transport channel.

Conclusions:

  • Donor-acceptor interactions are a powerful tool for controlling molecular packing in organic conjugated materials.
  • Tuning molecular packing through these interactions can significantly enhance charge transport properties.
  • The developed materials show promise for high-performance organic electronic devices.