有机太阳能电池
堆积
材料科学
杂原子
能量转换效率
非共价相互作用
热稳定性
化学
化学工程
烷基
分子
有机化学
光电子学
聚合物
工程类
氢键
作者
Shihao Chen,Shuang Zhu,Hong Lei,Wanling Deng,Yi Zhang,Yuang Fu,Zuiyi Zhong,Minghao Dong,Chunchen Liu,Xinhui Lu,Kai Zhang,Fei Huang
标识
DOI:10.1002/anie.202318756
摘要
Abstract The simultaneous improvement of efficiency and stability of organic solar cells (OSCs) for commercialization remains a challenging task. Herein, we designed asymmetric acceptors DT‐C8Cl and DT‐C8BTz with functional haloalkyl chains, in which the halogen atoms could induce noncovalent interactions with heteroatoms like O, S, and Se, etc ., thus leading to appropriately manipulated film morphology. Consequently, binary devices based on D18: DT‐C8Cl achieved a champion power conversion efficiency (PCE) of 19.40 %. The higher PCE of D18: DT‐C8Cl could be attributed to the enhanced π–π stacking, improved charge transport, and reduced recombination losses. In addition, the noncovalent interactions induced by haloalkyl chains could effectively suppress unfavorable morphology evolutions and thereby reduce trap density of states, leading to improved thermal and storage stability. Overall, our findings reveal that the rational design of asymmetric acceptors with functional haloalkyl chains is a novel and powerful strategy for simultaneously enhancing the efficiency and stability of OSCs.
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