4.6 Article

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

期刊

ACS ENERGY LETTERS
卷 7, 期 7, 页码 2196-2202

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.2c01082

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资金

  1. APRC Grant of the City University of Hong Kong [9380086]
  2. US Office of Naval Research [N00014-20-1-2191, 11307621, C6023-19GF]
  3. Research Grants Council of Hong Kong [GHP/018/20SZ]
  4. Guangdong Major Project of Basic and Applied Basic Research [2019B030302007]
  5. Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
  6. Hong Kong University of Science and Technology

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In this study, the addition of a small-molecule additive, Y6, improves the packing of the acceptor blocks in the block copolymer, leading to enhanced electron transport and improved device efficiency. Furthermore, the device stability is significantly improved by restricting molecular motion through the padding of Y6 into the nanovoids of the copolymer matrix.
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.

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