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Giant Molecule Acceptor Enables Highly Efficient Organic Solar Cells Processed Using Non-halogenated Solvent.

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Researchers developed new giant molecule acceptors (GMAs) for high-efficiency organic solar cells (OSCs) using non-halogenated solvents. One GMA achieved a record 18.27% power conversion efficiency (PCE) by overcoming small molecule acceptor aggregation.

Keywords:
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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • High-efficiency organic solar cells (OSCs) often rely on toxic halogenated solvents.
  • Non-halogenated solvent processing for OSCs is limited by small molecule acceptor (SMA) aggregation, hindering power conversion efficiency (PCE).

Purpose of the Study:

  • To develop novel giant molecule acceptors (GMAs) for efficient OSC fabrication using non-halogenated solvents.
  • To investigate the impact of vinyl π-spacer linking-site isomerization on GMA performance and OSC efficiency.

Main Methods:

  • Synthesis of two isomerized GMAs (EV-i and EV-o) with vinyl π-spacers and longer alkyl side chains.
  • Fabrication of OSCs using these GMAs processed with the non-halogenated solvent o-xylene (o-XY).
  • Characterization of molecular structure, conjugation, aggregation, and device performance (PCE).

Main Results:

  • EV-i exhibited a twisted molecular structure with enhanced conjugation, while EV-o had a planar structure with weakened conjugation.
  • OSCs utilizing EV-i achieved a high PCE of 18.27%, surpassing ECOD (16.40%) and EV-o (2.50%).
  • The 18.27% PCE is among the highest reported for OSCs processed from non-halogenated solvents.

Conclusions:

  • The optimized linking site in GMAs is crucial for high-performance, non-halogenated solvent-processed OSCs.
  • EV-i's twisted structure, strong absorbance, and high charge carrier mobility contribute to its superior performance.
  • GMAs represent promising candidates for sustainable and efficient organic solar cell technologies.