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Sulfur-containing polymers (SPS) are promising cathode interlayers (CILs) for organic solar cells (OSCs). SPS-based CILs offer superior charge transport and processing capabilities compared to traditional dipole-based CILs.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Cathode interlayers (CILs) are essential for optimizing organic solar cell (OSC) performance and stability.
  • Two main types of CILs exist: interfacial dipole-based and sulfur-containing polymer (SPS)-based CILs.

Purpose of the Study:

  • To review the potential of SPS-based CILs in OSC applications.
  • To elucidate the working mechanisms and material design strategies for SPS materials.
  • To provide insights into molecular design for enhanced SPS-based CILs.

Main Methods:

  • Summarized and discussed SPS-based CIL materials, including organic small molecules, conjugated polymers, nonconjugated polymers, and transition metal oxides (TMOs).
  • Revealed structure-property-performance relationships of SPS-based CIL materials.
  • Elucidated mechanisms for thickness insensitivity, environmental resistance, and photo-electric conversion in SPS-based CILs.

Main Results:

  • SPS-based CILs demonstrate superior charge transport and compatibility with large-area processing compared to dipole-based CILs.
  • Structure-property-performance relationships were established for various SPS material classes.
  • Mechanisms for achieving thickness insensitivity and environmental stability in SPS-based CILs were identified.

Conclusions:

  • SPS-based CILs represent a highly promising class of materials for efficient and stable OSCs.
  • Further research into molecular design and understanding of structure-property relationships will drive future advancements.
  • SPS-based CILs offer a pathway to overcome current limitations in OSC technology.