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Alkyl Chain Regiochemistry of Benzotriazole‐Based Donor Polymers Influencing Morphology and Performances of Non‐Fullerene Organic Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-01-10 , DOI: 10.1002/aenm.201702427 Shangshang Chen 1 , Lin Zhang 2 , Chao Ma 3 , Dong Meng 4 , Jianquan Zhang 1 , Guangye Zhang 1 , Zhengke Li 1 , Philip C. Y. Chow 1 , Wei Ma 2 , Zhaohui Wang 4 , Kam Sing Wong 3 , Harald Ade 5 , He Yan 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-01-10 , DOI: 10.1002/aenm.201702427 Shangshang Chen 1 , Lin Zhang 2 , Chao Ma 3 , Dong Meng 4 , Jianquan Zhang 1 , Guangye Zhang 1 , Zhengke Li 1 , Philip C. Y. Chow 1 , Wei Ma 2 , Zhaohui Wang 4 , Kam Sing Wong 3 , Harald Ade 5 , He Yan 1
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The effects of alkyl chain regiochemistry on the properties of donor polymers and performances of non‐fullerene organic solar cells are investigated. Two donor polymers (PfBTAZ and PfBTAZS) are compared that have nearly identical chemical structures except for the regiochemistry of alkyl chains. The optical properties and crystallinity of two polymers are nearly identical yet the PfBTAZ:O‐IDTBR blend exhibits nearly double domain size compared to the blend based on PfBTAZS:O‐IDTBR. To reveal the origins of the very different domain size of two blends, the morphology of neat polymer films is characterized, and it is found that PfBTAZ tends to aggregate into much larger polymer fibers without the presence of O‐IDTBR. This indicates that it is not the polymer:O‐IDTBR interactions but the intrinsic aggregation properties of two polymers that determine the morphology features of neat and blend films. The stronger aggregation tendency of PfBTAZ could be explained by its more co‐planar geometry of the polymer backbone arising from the different alkyl chain regiochemistry. Combined with the similar trend observed in another set of donor polymers (PTFB‐P and PTFB‐PS), the results provide an important understanding of the structure–property relationships that could guide the development of donor polymers for non‐fullerene organic solar cells.
中文翻译：
苯并三唑基供体聚合物的烷基链区域化学影响非富勒烯有机太阳能电池的形态和性能
研究了烷基链区域化学对给体聚合物性能和非富勒烯有机太阳能电池性能的影响。比较了两种供体聚合物（PfBTAZ和PfBTAZS），除了烷基链的区域化学外，它们的化学结构几乎相同。两种聚合物的光学性质和结晶度几乎相同，但与基于PfBTAZS：O-IDTBR的共混物相比，PfBTAZ：O-IDTBR的共混物展现出几乎两倍的畴尺寸。为了揭示两种共混物截然不同的畴尺寸的起源，对纯聚合物膜的形态进行了表征，发现PfBTAZ倾向于聚集成更大的聚合物纤维，而没有O-IDTBR。这表明它不是聚合物：O‐IDTBR相互作用，但两种聚合物的固有聚集特性决定了纯净和共混膜的形态特征。PfBTAZ较强的聚集趋势可以通过其不同的烷基链区域化学产生的聚合物主链更共面的几何形状来解释。结合在另一组供体聚合物（PTFB-P和PTFB-PS）中观察到的相似趋势，结果对可指导非富勒烯有机太阳能电池供体聚合物发展的结构-性质关系提供了重要的了解。
更新日期：2018-01-10
中文翻译：
苯并三唑基供体聚合物的烷基链区域化学影响非富勒烯有机太阳能电池的形态和性能
研究了烷基链区域化学对给体聚合物性能和非富勒烯有机太阳能电池性能的影响。比较了两种供体聚合物（PfBTAZ和PfBTAZS），除了烷基链的区域化学外，它们的化学结构几乎相同。两种聚合物的光学性质和结晶度几乎相同，但与基于PfBTAZS：O-IDTBR的共混物相比，PfBTAZ：O-IDTBR的共混物展现出几乎两倍的畴尺寸。为了揭示两种共混物截然不同的畴尺寸的起源，对纯聚合物膜的形态进行了表征，发现PfBTAZ倾向于聚集成更大的聚合物纤维，而没有O-IDTBR。这表明它不是聚合物：O‐IDTBR相互作用，但两种聚合物的固有聚集特性决定了纯净和共混膜的形态特征。PfBTAZ较强的聚集趋势可以通过其不同的烷基链区域化学产生的聚合物主链更共面的几何形状来解释。结合在另一组供体聚合物（PTFB-P和PTFB-PS）中观察到的相似趋势，结果对可指导非富勒烯有机太阳能电池供体聚合物发展的结构-性质关系提供了重要的了解。
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