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Isoindigo-Based Small Molecules with Varied Donor Components for Solution-Processable Organic Field Effect Transistor

Hemlata Patil1, Jingjing Chang2, Akhil Gupta3,4

  • 1School of Applied Sciences, RMIT University, GPO Box 2476, Melbourne Victoria 3001, Australia. hemlatap2@gmail.com.

Molecules (Basel, Switzerland)
|September 23, 2015
PubMed
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Two new organic semiconductors, S10 and S11, were synthesized for electronic applications. S11, featuring a carbazole donor, exhibited higher hole mobility than S10, indicating its potential for advanced semiconductor devices.

Area of Science:

  • Organic electronics
  • Materials science
  • Semiconductor physics

Background:

  • Development of solution-processable organic semiconductors is crucial for low-cost electronic devices.
  • Donor-acceptor-donor (D-A-D) structures are widely explored for tuning optoelectronic properties.
  • Isoindigo-based materials offer a promising platform for organic semiconductor research.

Purpose of the Study:

  • To design, synthesize, and characterize two novel small organic molecules (S10 and S11) with D-A-D structures.
  • To investigate the structure-property relationships of triphenylamine and carbazole as donor units in isoindigo-based semiconductors.
  • To evaluate the charge-carrier mobilities of S10 and S11 in solution-processable organic field-effect transistors (OFETs).

Main Methods:

Keywords:
carbazoledonor-acceptor-donorisoindigoorganic field effect transistorssolution-processabletriphenylamine

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  • Chemical synthesis and full characterization of S10 and S11.
  • Ultraviolet-visible (UV-Vis) absorption spectroscopy to determine optical band gaps.
  • Fabrication and characterization of organic field-effect transistors (OFETs) to measure charge-carrier mobility.

    • Main Results:

    • S10 and S11 were successfully synthesized and exhibited excellent solubility and thermal stability.
    • The triphenylamine donor in S10 led to enhanced intramolecular charge transfer and a reduced optical band gap compared to the carbazole donor in S11.
    • Hole mobilities of 2.2 × 10⁻⁴ cm²/Vs for S10 and 7.8 × 10⁻³ cm²/Vs for S11 were achieved in OFETs.

    Conclusions:

    • The designed isoindigo-based organic semiconductors demonstrate tunable optoelectronic properties based on the choice of donor unit.
    • S11, with its carbazole donor, exhibits significantly higher hole mobility, making it a promising candidate for high-performance organic electronic applications.
    • Solution-processable small molecules offer a viable route for fabricating efficient organic electronic devices.