Efficient Fused-Ring Extension of A-D-A-Type Non-Fullerene Acceptors by a Symmetric Replicating Core Unit Strategy.,Chemistry - A European Journal

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Efficient Fused-Ring Extension of A-D-A-Type Non-Fullerene Acceptors by a Symmetric Replicating Core Unit Strategy.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-03-25 , DOI: 10.1002/chem.202000889
Tian Xia ₁ , Chao Li ₁ , Hwa Sook Ryu ₂ , Jing Guo _{3,

4} , Jie Min _{3,

4} , Han Young Woo ₂ , Yanming Sun ₁

Affiliation

The extension of fused aromatic ring core structures is beneficial for enhancing intramolecular charge transfer and effective π conjugation in A–D–A‐type (A=acceptor; D=donor) non‐fullerene acceptors (NFAs). In this work, a novel strategy involving the extension of a fused‐ring core by symmetrically replicating the core unit has been developed, and a novel symmetric fused‐12‐ring NFA, LC81, has been synthesized. When paired with the wide‐bandgap polymer donor PBT1‐C, the corresponding organic solar cells (OSCs) showed a high power conversion efficiency of 12.71 %, much higher than that of the device based on the reference NFA, TPTT‐4F. Moreover, the LC81‐based OSC displayed a lower energy loss and a better ambient stability than the TPTT‐4F‐based device. Our results indicate that the extension of the fused‐ring core by the symmetric replicating core unit strategy is an effective approach to promoting the photovoltaic characteristics of A–D–A‐type NFAs.

中文翻译：

通过对称复制核心单元策略对ADA型非富勒烯受体进行有效的融合环扩展。

稠合芳环核结构的扩展有利于增强分子内电荷转移和A–D–A–型（A =受体； D =供体）非富勒烯受体（NFA）的有效π共轭。在这项工作中，开发了一种通过对称复制核心单元来扩展稠环核心的新策略，并且合成了新型对称稠环-12环NFA LC81。与宽带隙聚合物供体PBT1-C配对时，相应的有机太阳能电池（OSC）表现出12.71％的高功率转换效率，远高于基于参考NFA TPTT-4F的器件的转换效率。此外，与基于TPTT-4F的设备相比，基于LC81的OSC表现出更低的能量损耗和更好的环境稳定性。

更新日期：2020-03-25

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