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Decoding the Vertical Phase Separation and Its Impact on C8-BTBT/PS Transistor Properties.

Ana Pérez-Rodríguez1, Inés Temiño1, Carmen Ocal1

  • 1Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) , Campus de la UAB, 08193 Bellaterra, Spain.

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Understanding vertical distribution in small molecule:polymer blends is key for organic transistors. This study reveals a three-layer structure and highlights contact limitations, suggesting doping for improved performance.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Nanotechnology

Background:

  • Optimizing organic field-effect transistors (OFETs) requires understanding small molecule:polymer blend behavior.
  • Vertical distribution and contact properties critically influence device performance.

Purpose of the Study:

  • To investigate the nanoscale vertical distribution of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) and polystyrene (PS) blends.
  • To analyze the impact of blend composition on OFET performance and contact properties.
  • To identify strategies for optimizing organic transistor design.

Main Methods:

  • Solution-shearing technique for processing ultrathin C8-BTBT:PS blends.
  • Friction force microscopy (FFM) for nanoscale material distribution analysis.
  • Kelvin probe force microscopy (KPFM) for evaluating contact properties in operating OFETs.

Main Results:

  • Demonstrated a three-layer stratification: crystalline C8-BTBT core sandwiched by PS-rich layers.
  • Identified significant contact limitations affecting OFET performance.
  • Achieved field-effect mobility up to 10 cm² V⁻¹ s⁻¹ in the channel after excluding contact effects.

Conclusions:

  • The vertical stratification and PS-rich layers influence OFET electrical properties.
  • Device performance is strongly limited by contacts, indicating contact doping as an optimization strategy.
  • FFM and KPFM provide crucial insights into blend morphology and device physics for organic electronics.