articleNature CommunicationsJan 10, 2026GOLD OA

Alleviating non-radiative losses in organic solar cells through side-chain regulation of low-bandgap non-fullerene acceptors

QFQi FengQLQian LiHLHao LuRZRui ZhangSLShuzhe Liu

Qingdao University · City University of Hong Kong · +5 more institutions

PubMed
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Abstract

Non-radiative losses present a significant hurdle limiting the performance of organic solar cells (OSCs). Selenium substitution in non-fullerene acceptors (NFAs) is an effective approach for tuning intermolecular stacking and energy levels in state-of-the-art near-infrared absorbing OSCs. However, the inter-system crossing (ISC) induced by selenium may enhance the formation of triplet excitons in NFAs, aggravating non-radiative losses in OSCs. Herein, we have structurally engineered selenium-containing NFAs through introducing achiral N-alkyl substituents with varied branching sites at C2 or C3 position onto the pyrrole moiety of NFA core. We find that the C2-branched ones in our material system exhibit more…

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Topics & keywords

Topics
Keywords
  • Stacking
  • Moiety
  • Ternary operation
  • Organic solar cell
  • Exciton
  • Quantum efficiency
  • Limiting
  • Intermolecular force
UN Sustainable Development Goals
  • Affordable and clean energy
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