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High-Efficiency Organic Solar Cells Enabled by Siloxane-Functionalized Pyrazine Terpolymers: Synergizing Performance,

Wenwen Hou1, Jingnan Wu2, Bo Cheng1

  • 1National Engineering Research Center for Colloidal Materials, Key Laboratory of Special Functional Aggregated Materials (Shandong University), Ministry of Education, School of Chemistry & Chemical Engineering, Shandong University, Jinan, Shandong, China.

Advanced Materials (Deerfield Beach, Fla.)
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PubMed
Summary
This summary is machine-generated.

Researchers developed new organic solar cells (OSCs) using siloxane-functionalized terpolymers. This design improves performance and allows processing with eco-friendly, non-halogenated solvents, boosting power conversion efficiency (PCE).

Keywords:
morphological controlnon‐halogenated solvent processingorganic solar cellsrandom terpolymerization

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Scalable and sustainable organic solar cells (OSCs) face challenges in balancing high performance, morphological control, and non-halogenated solvent processing.
  • Achieving high power conversion efficiency (PCE) requires optimized morphology and molecular ordering.

Purpose of the Study:

  • To address the bottleneck in OSC processing by designing novel terpolymers.
  • To enhance morphological controllability and compatibility with non-halogenated solvents for scalable OSC fabrication.

Main Methods:

  • Rational terpolymer design by integrating a siloxane-functionalized electron-deficient pyrazine unit (DTCPz-SiO) into the D18 backbone.
  • Synthesis and characterization of the optimized terpolymer DN1 containing 5 mol% DTCPz-SiO.
  • Fabrication and performance evaluation of binary and ternary organic solar cells.

Main Results:

  • The DTCPz-SiO unit enhanced backbone planarity, π-π stacking, and crystallization through intramolecular interactions.
  • DN1 terpolymers demonstrated improved donor-acceptor miscibility and compatibility with non-halogenated solvents.
  • DN1-based binary OSCs achieved a PCE of 20.1% (vs. 18.7% for parent polymer), with efficiencies around 19.5% using non-halogenated solvents.
  • Ternary OSCs reached outstanding PCEs of 20.9% (chlorinated) and 20.0% (non-halogenated).

Conclusions:

  • Siloxane-functionalized terpolymers offer an effective strategy for regulating multi-scale morphology and processing tolerance in OSCs.
  • This molecular design approach provides insights for developing scalable and sustainable organic solar cell systems.
  • The developed terpolymers enable high-efficiency OSCs compatible with environmentally friendly processing methods.