共轭体系
材料科学
Knoevenagel冷凝
戒指(化学)
光化学
亲核细胞
降级(电信)
有机太阳能电池
分子工程
组合化学
纳米技术
化学
有机化学
聚合物
催化作用
电信
复合材料
计算机科学
作者
Hongtao Liu,Yibin Li,Shaoheng Xu,Yinhua Zhou,Zhong’an Li
标识
DOI:10.1002/adfm.202106735
摘要
Abstract The power conversion efficiency of organic solar cells (OSCs) has made exceptionally rapid progress in the past five years owing to the emergence of fused‐ring electron acceptors (FREAs). To achieve the commercialization, it is urgent to resolve the stability issues of OCSs from materials to devices. In particular, the state‐of‐the‐art FREAs, often synthesized by Knoevenagel condensation, generally contain two exocyclic vinyl groups (CC bond) as the conjugated bridges, which inevitably exhibit an obvious electron‐deficient characteristic due to the strong push‐pull electronic effect. As a result, these vinyl bridges are vulnerable to nucleophile attacking and/or photooxidation, leading to poor chemical and photochemical stabilities of FREAs that easily cause the degradation of device performance. In this perspective, an in‐depth understanding of the degradation mechanism of FREAs is provided, and then effective strategies reported recently are reviewed for improving the chemical and photochemical stabilities of FREAs from interfacial engineering to molecular engineering to additive engineering. Finally, a conclusion and outlook for the future design of highly efficient and stable FREAs are also presented.
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