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Optimizing Double-Fibril Network Morphology via Solid Additive Strategy Enables Binary All-Polymer Solar Cells with

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  • 1Hangzhou International Innovation Institute, Beihang University, Hangzhou, 311115, P. R. China.

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Summary

A novel solid additive strategy optimizes double-fibril network morphology in all-polymer solar cells, boosting efficiency to 19.50% and enhancing photostability for improved organic solar cell performance.

Keywords:
all‐polymer solar cellsdouble‐fibril network morphologyefficienciessolid additives

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Double-fibril network morphology (DFNM) is crucial for efficient exciton dissociation and charge transport in organic solar cells.
  • Achieving optimal DFNM in all-polymer solar cells (all-PSCs) remains a challenge.

Purpose of the Study:

  • To demonstrate and optimize DFNM in all-PSCs using volatile solid additives.
  • To investigate the role of 2-alkoxynaphthalene additives in controlling molecular aggregation and self-assembly.

Main Methods:

  • Utilized 2-alkoxynaphthalene derivatives as volatile solid additives during film processing.
  • Tuned intermolecular interactions and miscibility by altering the alkoxy group of the additives.
  • Analyzed the impact of additives on molecular aggregation, packing, and DFNM.

Main Results:

  • Successfully induced stepwise regulation of donor and acceptor aggregation with 2-alkoxynaphthalene.
  • Achieved optimized molecular packing and DFNM through precise control of molecular aggregation.
  • Obtained a record efficiency of 19.50% (certified 19.1%) for PM6:PY-DT-X all-PSCs.

Conclusions:

  • Solid additive strategy using 2-alkoxynaphthalene effectively optimizes DFNM in all-PSCs.
  • This approach significantly enhances power conversion efficiency and photostability.
  • DFNM optimization via solid additives presents a promising pathway for advancing all-PSC technology.