Non-Fullerene Acceptor Doped Block Copolymer for Efficient and Stable Organic Solar Cells

Yue Wu, Qunping Fan, Baobing Fan, Feng Qi, Ziang Wu, Francis R. Lin, Yang Li, Chun Sing Lee, Han Young Woo, Hin Lap Yip, Alex K.Y. Jen

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Bulk-heterojunction organic solar cells (OSCs) often suffer from morphological instability due to thermo- or photoinduced molecular diffusion. To circumvent such instability, OSCs incorporating a single-component block copolymer with covalently bonded blocks can restrain molecular diffusion. However, the device efficiencies of such block copolymers are lagging behind those based on a blended active layer due to a nonideal morphological problem. Herein, we successfully alleviate this problem by introducing a small-molecule additive, Y6, having a structure similar to that of the acceptor block. The addition of Y6 improves the packing of acceptor blocks in the block copolymer, PM6-b-PYIT. This helps improve electron transport and enhances the device efficiency to 15.55%, representing the highest value reported for block-copolymer-based OSCs. Moreover, the device stability is significantly improved due to the padding of Y6 into the nanovoids of the copolymer matrix to restrict the molecular motion. This work presents an effective strategy to address the efficiency-stability tradeoff in OSCs.

Original languageEnglish
Pages (from-to)2196-2202
Number of pages7
JournalACS Energy Letters
Volume7
Issue number7
DOIs
Publication statusPublished - 2022 Jul 8

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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