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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Organic solar cells (OSCs) are a key area in renewable energy research.
  • Non-fullerene small-molecule acceptors (NFSMAs) are crucial components in high-performance OSCs.
  • Asymmetric molecular design in NFSMAs has shown promise for improved device efficiency.

Purpose of the Study:

  • To systematically investigate the structure-property-performance relationships of asymmetric NFSMAs.
  • To clarify the feasibility and practicality of using an asymmetric strategy for NFSMA design.
  • To provide insights for developing higher-performance NFSMAs in organic solar cells.

Main Methods:

  • Systematic investigation of structure-property-performance relationships.
  • Analysis of molecular conformation, packing, solubility, and crystallinity.
  • Review of recent advancements in asymmetric NFSMA design.

Main Results:

  • Asymmetric NFSMAs exhibit larger dipole moments and stronger intermolecular interactions.
  • These acceptors have achieved power conversion efficiencies exceeding 18% in OSCs.
  • The asymmetric strategy allows for a balance between solubility and crystallinity, impacting molecular packing.

Conclusions:

  • The asymmetric strategy is a viable and practical approach for designing high-performance NFSMAs.
  • Understanding structure-property relationships is key to optimizing NFSMA design.
  • Further development of asymmetric NFSMAs holds significant potential for advancing organic photovoltaics.