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Interface engineering and solid-state organization for triindole-based p-type organic thin-film transistors.

Marta Reig1, Gintautas Bagdziunas, Arunas Ramanavicius

  • 1Grup de Materials Orgànics, Institut de Nanociència i Nanotecnologia (IN2UB), Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica, Universitat de Barcelona, Martí i Franquès 1, E-08028, Barcelona, Spain. dvelasco@ub.edu.

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This study explores how solid-state organization affects charge transport in triindole semiconductors for organic thin-film transistors (OTFTs). Surface treatments optimize molecular growth, leading to improved device performance and mobility.

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Area of Science:

  • Organic electronics
  • Semiconductor physics
  • Materials science

Background:

  • Triindole derivatives show promise in electronic and optoelectronic devices.
  • Understanding the link between solid-state organization and charge transport is crucial for optimizing semiconductor performance.

Purpose of the Study:

  • To investigate the relationship between solid-state organization and charge-transporting properties of triindole derivatives.
  • To explore how surface treatments influence molecular growth and film morphology in organic thin-film transistors (OTFTs).

Main Methods:

  • Fabrication of vacuum-evaporated organic thin-film transistors (OTFTs).
  • Surface treatment of gate insulators using self-assembled monolayers (SAMs) or polymers.
  • Characterization using X-ray diffraction (XRD), atomic force microscopy (AFM), and theoretical calculations.

Main Results:

  • OTFTs exhibited non-ideal behavior with double slopes in saturation curves.
  • Surface treatments effectively controlled molecular growth and film morphology.
  • N-Trihexyltriindole demonstrated high hole mobilities (up to 0.1 cm²/V·s) and Ion/Ioff ratios (~10⁶).

Conclusions:

  • Interfacial disorder may contribute to the non-ideal behavior observed in the studied OTFT devices.
  • Surface modification is a viable strategy to tune the performance of triindole-based organic semiconductors.