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An Optimized Fibril Network Morphology Enables High‐Efficiency and Ambient‐Stable Polymer Solar Cells
Advanced Science ( IF 14.3 ) Pub Date : 2020-07-26 , DOI: 10.1002/advs.202001986 Jiali Song 1 , Linglong Ye 1 , Chao Li 1 , Jinqiu Xu 2 , Sreelakshmi Chandrabose 3 , Kangkang Weng 1 , Yunhao Cai 1 , Yuanpeng Xie 1 , Padraic O'Reilly 4 , Kai Chen 3 , Jiajia Zhou 1 , Yi Zhou 5 , Justin M Hodgkiss 3 , Feng Liu 2 , Yanming Sun 1
Advanced Science ( IF 14.3 ) Pub Date : 2020-07-26 , DOI: 10.1002/advs.202001986 Jiali Song 1 , Linglong Ye 1 , Chao Li 1 , Jinqiu Xu 2 , Sreelakshmi Chandrabose 3 , Kangkang Weng 1 , Yunhao Cai 1 , Yuanpeng Xie 1 , Padraic O'Reilly 4 , Kai Chen 3 , Jiajia Zhou 1 , Yi Zhou 5 , Justin M Hodgkiss 3 , Feng Liu 2 , Yanming Sun 1
Affiliation
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Morphological stability is crucially important for the long‐term stability of polymer solar cells (PSCs). Many high‐efficiency PSCs suffer from metastable morphology, resulting in severe device degradation. Here, a series of copolymers is developed by manipulating the content of chlorinated benzodithiophene‐4,8‐dione (T1‐Cl) via a random copolymerization approach. It is found that all the copolymers can self‐assemble into a fibril nanostructure in films. By altering the T1‐Cl content, the polymer crystallinity and fibril width can be effectively controlled. When blended with several nonfullerene acceptors, such as TTPTT‐4F, O‐INIC3, EH‐INIC3, and Y6, the optimized fibril interpenetrating morphology can not only favor charge transport, but also inhibit the unfavorable molecular diffusion and aggregation in active layers, leading to excellent morphological stability. The work demonstrates the importance of optimization of fibril network morphology in realizing high‐efficiency and ambient‐stable PSCs, and also provides new insights into the effect of chemical structure on the fibril network morphology and photovoltaic performance of PSCs.
中文翻译：
优化的原纤维网络形态可实现高效且环境稳定的聚合物太阳能电池
形态稳定性对于聚合物太阳能电池（PSC）的长期稳定性至关重要。许多高效 PSC 都存在亚稳态形态，导致器件严重退化。在这里，通过无规共聚方法控制氯化苯并二噻吩-4,8-二酮（T1-Cl）的含量，开发了一系列共聚物。研究发现所有共聚物都可以在薄膜中自组装成原纤维纳米结构。通过改变T1-Cl含量，可以有效控制聚合物结晶度和原纤维宽度。当与TTPTT-4F、O-INIC3、EH-INIC3和Y6等多种非富勒烯受体混合时，优化的原纤维互穿形态不仅有利于电荷传输，而且可以抑制活性层中不利的分子扩散和聚集，从而导致优异的形态稳定性。该工作证明了原纤维网络形态优化在实现高效和环境稳定的PSCs中的重要性，也为化学结构对PSCs原纤维网络形态和光伏性能的影响提供了新的见解。
更新日期：2020-09-23
中文翻译：
优化的原纤维网络形态可实现高效且环境稳定的聚合物太阳能电池
形态稳定性对于聚合物太阳能电池（PSC）的长期稳定性至关重要。许多高效 PSC 都存在亚稳态形态，导致器件严重退化。在这里，通过无规共聚方法控制氯化苯并二噻吩-4,8-二酮（T1-Cl）的含量，开发了一系列共聚物。研究发现所有共聚物都可以在薄膜中自组装成原纤维纳米结构。通过改变T1-Cl含量，可以有效控制聚合物结晶度和原纤维宽度。当与TTPTT-4F、O-INIC3、EH-INIC3和Y6等多种非富勒烯受体混合时，优化的原纤维互穿形态不仅有利于电荷传输，而且可以抑制活性层中不利的分子扩散和聚集，从而导致优异的形态稳定性。该工作证明了原纤维网络形态优化在实现高效和环境稳定的PSCs中的重要性，也为化学结构对PSCs原纤维网络形态和光伏性能的影响提供了新的见解。
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