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Blade-Coated All-Polymer Organic Solar Cells with 15% Efficiency Using Eco-Friendly Solvent Systems.

Mohamed El Amine Kramdi1,2, Aral Karahan1, Lydia Abbassi1,2

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Summary
This summary is machine-generated.

Researchers developed a scalable, eco-friendly method for fabricating high-efficiency organic solar cells (OSCs) using green solvents and doctor-blade coating. This advancement paves the way for sustainable manufacturing of all-polymer solar cells (all-PSCs).

Keywords:
all-polymer solar cellsblade coating techniquehigh efficiencynon-halogenated solventorganic photovoltaics

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Organic Electronics

Background:

  • Organic solar cells (OSCs) offer advantages like flexibility and semitransparency.
  • Recent progress in polymerized small-molecule acceptors (PSMAs) has boosted all-polymer solar cell (all-PSC) efficiencies.
  • Scalable and environmentally friendly fabrication methods are crucial for commercializing all-PSCs.

Purpose of the Study:

  • To report the first scalable fabrication of PM6:PY-IT all-polymer solar cells using green solvents and doctor-blade coating.
  • To optimize ink formulation and processing for improved active layer morphology and crystallinity.
  • To demonstrate efficient charge transport and device performance under ambient conditions.

Main Methods:

  • Utilized doctor-blade coating with the green solvent *o*-xylene at ambient temperature in air.
  • Employed controlled heating, stirring, and vortexing for ink formulation.
  • Characterized film morphology and crystallinity using AFM, TEM, and GIWAXS.
  • Evaluated charge transport properties via the space-charge limited current (SCLC) method.

Main Results:

  • Achieved a power conversion efficiency (PCE) of 15% for PM6:PY-IT devices.
  • Obtained a short-circuit current density (Jsc) of 22.54 mA/cm², open-circuit voltage (Voc) of 0.91 V, and fill factor (FF) of 67.2%.
  • Optimized ink formulation led to improved film morphology and crystallinity.

Conclusions:

  • The developed doctor-blade coating method using *o*-xylene is a scalable and environmentally friendly approach for all-PSC fabrication.
  • Ambient, low-energy processing conditions are suitable for efficient manufacturing.
  • This work highlights a promising pathway for sustainable and cost-effective production of high-performance all-PSCs.