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Morphology, Crystallinity, and Electrical Performance of Solution-Processed OFETs Based on a DPP-Based Small

Enrique Caldera-Cruz1,2, Reshma Raveendran3, Yevhen Karpov4

  • 1Leibniz Institute of Polymer Research Dresden, Hohe Straße 6, Dresden 01069, Germany.

ACS Applied Electronic Materials
|August 18, 2025
PubMed
Summary

Researchers synthesized a novel diketopyrrolopyrrole (DPP)-based small molecule for organic field-effect transistors (OFETs). Solution-processing techniques optimized film crystallinity, leading to enhanced OFET performance with high mobility.

Keywords:
GIWAXSOFETcrystallinitydiketopyrrolopyrrolemobilitysolution-processable semiconductorssolution-shearing

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Area of Science:

  • Organic electronics
  • Materials science
  • Semiconductor physics

Background:

  • Diketopyrrolopyrrole (DPP)-based small molecules are promising for organic electronics.
  • Controlling thin-film morphology is crucial for optimizing organic field-effect transistor (OFET) performance.
  • Solution-processing offers a scalable fabrication route for organic electronic devices.

Purpose of the Study:

  • To synthesize and characterize a novel DPP-based small molecule, DBT-I.
  • To investigate the impact of solution-processing techniques and solvent environments on DBT-I thin-film morphology and crystallinity.
  • To correlate film microstructure with OFET device performance.

Main Methods:

  • Stille coupling for DBT-I synthesis.
  • Thin-film deposition using spin coating and solution-shearing.
  • Systematic variation of solvents and thermal treatments.
  • Fabrication and characterization of organic field-effect transistors (OFETs).

Main Results:

  • DBT-I thin films exhibited enhanced crystallinity through optimized processing conditions (solvent, deposition, thermal treatment).
  • Solution-sheared DBT-I films showed superior morphology with improved crystallinity and grain size.
  • Optimal OFET performance was achieved with shear-coated films, yielding a mobility of 0.26 cm² V⁻¹ s⁻¹ and a current on-off ratio of 10⁶.

Conclusions:

  • Processing conditions significantly influence the morphology and crystallinity of DBT-I thin films.
  • Solution-shearing is an effective method for fabricating high-performance OFETs based on DBT-I.
  • The correlation between morphology and device performance allows for rational optimization of OFET characteristics.