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Researchers optimized organic solar cells (OSCs) by controlling vertical stratification. Modifying substrate surface energy with self-assembled small molecules (SASM) improved power conversion efficiencies over 10.5%.

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external quantum efficiencyinterface engineeringorganic bulk-heterojunctionorganic photovoltaicsself-assembled small moleculestratification engineeringsurface energy

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • High-efficiency organic solar cells (OSCs) rely on molecular design, interfacial engineering, and active layer morphology.
  • Vertical stratification in bulk-heterojunctions (BHJ) is a spontaneous process during drying that hinders OSC performance.
  • Understanding and controlling vertical stratification is crucial for enhancing OSC efficiency.

Purpose of the Study:

  • To explore methods for regulating vertical separation profiles in OSCs.
  • To link material surface energy, absorption, and vertical stratification to photovoltaic performance.
  • To achieve optimal vertical stratification through artificial multilayered structures and substrate modification.

Main Methods:

  • Created temporary, artificial vertically stratified layers via sequential casting of donor and acceptor components.
  • Modified substrate surface energy using self-assembled small molecules (SASM).
  • Fabricated inverted OSCs using various donor polymers and acceptors, analyzing the donor-to-acceptor ratio at the ITO/BHJ interface.

Main Results:

  • Established a correlation between material surface energy, absorption, vertical stratification, and photovoltaic characteristics.
  • Demonstrated that adjusting substrate surface energy offset stabilizes the stratified layer, influencing donor and acceptor distribution.
  • Achieved synchronized enhancement in external quantum efficiency and power conversion efficiencies exceeding 10.5% through SASM modification.

Conclusions:

  • Controlling vertical stratification via substrate surface energy modification is an effective strategy for improving OSC performance.
  • SASM enables precise tuning of the donor-acceptor ratio at the electrode interface, boosting device efficiency.
  • This approach offers a viable route to high-performance OSCs by managing active layer morphology.