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Green Solvent-Processed Organic Solar Cells Approaching 20.4% Efficiency via Active Layer Pre-Solidification.

Xiaopeng Duan1,2, Jiali Song1,2, Junjie Zhang2

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Summary

A novel liquid nitrogen freezing process enables efficient organic solar cells (OSCs) using green solvents. This method minimizes efficiency loss and promotes large-scale commercialization of sustainable photovoltaics.

Keywords:
active layer pre‐solidificationgreen solventsmolecular aggregationorganic solar cellsphase separation

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Area of Science:

  • Materials Science
  • Renewable Energy

Background:

  • Green solvent fabrication is crucial for sustainable organic solar cells (OSCs).
  • Transitioning to green solvents often causes efficiency drops due to molecular aggregation.

Purpose of the Study:

  • To develop a method for fabricating efficient OSCs using green solvents.
  • To overcome the efficiency gap between halogenated and green solvent processing.

Main Methods:

  • Active layer pre-solidification using liquid nitrogen freezing.
  • Analysis of molecular precipitation and crystallization using PiFM and GISAXs.
  • Fabrication of organic solar cells (OSCs) with PM6:L8BO-X:BO-8F using o-xylene.

Main Results:

  • The pre-solidification process effectively suppressed excessive phase separation.
  • Achieved a record OSC efficiency of 20.38% with o-xylene, comparable to chloroform-processed devices.
  • Demonstrated universality across different photovoltaic materials and inhibited the coffee-ring effect for large-area films.

Conclusions:

  • The liquid nitrogen freezing pre-solidification strategy effectively eliminates performance losses associated with green solvents.
  • This technique facilitates an ideal longitudinal gradient arrangement of photovoltaic materials, enhancing charge transport.
  • The study paves a sustainable path for the large-scale commercialization of organic photovoltaics.