Suxiang Ma, Bangbang Li, Shaokuan Gong, Junwei Wang, Bin Liu, Sang Young Jeong, Xihan Chen, Han Young Woo, Kui Feng, Xugang Guo

Biselenophene Imide: Enabling Polymer Acceptor with High Electron Mobility for High‐Performance All‐Polymer Solar Cells

  • General Chemistry
  • Catalysis
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AbstractThe shortage of narrow band gap polymer acceptors with high electron mobility is the major bottleneck for developing efficient all‐polymer solar cells (all‐PSCs). Herein, we synthesize a distannylated electron‐deficient biselenophene imide monomer (BSeI‐Tin) with high purity/reactivity, affording an excellent chance to access acceptor–acceptor (A–A) type polymer acceptors. Copolymerizing BSeI‐Tin with dibrominated monomer Y5‐Br, the resulting A–A polymer PY5‐BSeI shows a higher molecular weight, narrower band gap, deeper‐lying frontier molecular orbital levels and larger electron mobility than the donor–acceptor type counterpart PY5‐BSe. Consequently, the PY5‐BSeI‐based all‐PSCs deliver a remarkable efficiency of 17.77 % with a high short‐circuit current of 24.93 mA cm−2 and fill factor of 75.83 %. This efficiency is much higher than that (10.70 %) of the PY5‐BSe‐based devices. Our study demonstrates that BSeI is a promising building block for constructing high‐performance polymer acceptors and stannylation of electron‐deficient building blocks offers an excellent approach to developing A–A type polymers for all‐PSCs and even beyond.

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