Effects of Short‐Axis Alkoxy Substituents on Molecular Self‐Assembly and Photovoltaic Performance of Indacenodithiophene‐Based Acceptors,Advanced Functional Materials

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Effects of Short‐Axis Alkoxy Substituents on Molecular Self‐Assembly and Photovoltaic Performance of Indacenodithiophene‐Based Acceptors
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-10-24 , DOI: 10.1002/adfm.201906855
Xiaojun Li _{1,

2} , He Huang ₂ , Indunil Angunawela ₃ , Jiadong Zhou ₄ , Jiaqi Du _{1,

2} , Alex Liebman‐Pelaez ₅ , Chenhui Zhu ₅ , Zhanjun Zhang ₂ , Lei Meng ₁ , Zengqi Xie ₄ , Harald Ade ₃ , Yongfang Li _{1,

2,

6}

Affiliation

The effects of central alkoxy side chain length of a series of narrow bandgap small molecule acceptors (SMAs) on their physicochemical properties and on the photovoltaic performance of the SMA‐based polymer solar cells (PSCs) are systematically investigated. It is found that the ordered aggregation of these SMAs in films is enhanced gradually with the increase of alkoxy chain length. The single‐crystal structures of these SMAs further reveal that small changes in the side chain length can have a dramatic impact on molecular self‐assembly. The short‐circuit current density and power conversion efficiency values of the corresponding PSCs increase with the increase of the side chain length of the SMAs. The π–π coherence length of the SMAs in the active layers is increased with the increase of the side chain length, which could be the reason for the increase of the J_sc in the PSCs. The results indicate that small changes in side chain length can have a dramatic impact on the molecular self‐assembly, morphology, and photovoltaic performance of the PSCs. The structure–performance relationship established in this study can provide important instructions for the side chain engineering and for the design of efficient SMAs materials.

中文翻译：

短轴烷氧基取代基对基于茚并二噻吩基受体的分子自组装和光伏性能的影响

系统地研究了一系列窄带隙小分子受体（SMA）的中心烷氧基侧链长度对其理化性质以及对基于SMA的聚合物太阳能电池（PSC）的光伏性能的影响。结果发现，随着烷氧基链长度的增加，薄膜中这些SMA的有序聚集逐渐增强。这些SMA的单晶结构进一步表明，侧链长度的微小变化会对分子自组装产生巨大影响。相应PSC的短路电流密度和功率转换效率值随SMA侧链长度的增加而增加。活性层中SMA的π–π相干长度随着侧链长度的增加而增加，PSC中的J _sc。结果表明，侧链长度的微小变化可能会对PSC的分子自组装，形态和光伏性能产生重大影响。这项研究中建立的结构与性能之间的关系可以为侧链工程和高效SMAs材料的设计提供重要指导。

更新日期：2020-01-17

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