Asymmetric Alkyl Side‐Chain Engineering of Naphthalene Diimide‐Based n‐Type Polymers for Efficient All‐Polymer Solar Cells,Macromolecular Rapid Communications

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Asymmetric Alkyl Side‐Chain Engineering of Naphthalene Diimide‐Based n‐Type Polymers for Efficient All‐Polymer Solar Cells
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2018-02-13 , DOI: 10.1002/marc.201700765
Tao Jia ₁ , Zhenye Li ₁ , Lei Ying ₁ , Jianchao Jia ₁ , Baobing Fan ₁ , Wenkai Zhong ₁ , Feilong Pan ₁ , Penghui He ₁ , Junwu Chen ₁ , Fei Huang ₁ , Yong Cao ₁

Affiliation

The design and synthesis of three n‐type conjugated polymers based on a naphthalene diimide–thiophene skeleton are presented. The control polymer, PNDI‐2HD, has two identical 2‐hexyldecyl side chains, and the other polymers have different alkyl side chains; PNDI‐EHDT has a 2‐ethylhexyl and a 2‐decyltetradecyl side chain, and PNDI‐BOOD has a 2‐butyloctyl and a 2‐octyldodecyl side chain. These copolymers with different alkyl side chains exhibit higher melting and crystallization temperatures, and stronger aggregation in solution, than the control copolymer PNDI‐2HD that has the same side chain. Polymer solar cells based on the electron‐donating copolymer PTB7‐Th and these novel copolymers exhibit nearly the same open‐circuit voltage of 0.77 V. Devices based on the copolymer PNDI‐BOOD with different side chains have a power‐conversion efficiency of up to 6.89%, which is much higher than the 4.30% obtained with the symmetric PNDI‐2HD. This improvement can be attributed to the improved charge‐carrier mobility and the formation of favorable film morphology. These observations suggest that the molecular design strategy of incorporating different side chains can provide a new and promising approach to developing n‐type conjugated polymers.

中文翻译：

萘二酰亚胺基n型聚合物的非对称烷基侧链工程学，用于高效全聚合物太阳能电池

介绍了基于萘二酰亚胺-噻吩骨架的三种n型共轭聚合物的设计和合成。对照聚合物PNDI-2HD具有两个相同的2-己基癸基侧链，其他聚合物具有不同的烷基侧链。PNDI-EHDT具有2-乙基己基和2-癸基十四烷基侧链，而PNDI-BOOD具有2-丁基辛基和2-辛基十二烷基侧链。这些具有不同烷基侧链的共聚物比具有相同侧链的对照共聚物PNDI-2HD表现出更高的熔融和结晶温度，以及在溶液中更强的聚集。基于给电子共聚物PTB7-Th和这些新型共聚物的聚合物太阳能电池的开路电压几乎相同，为0.77V。基于具有不同侧链的共聚物PNDI-BOOD的设备的功率转换效率高达6.89％，远高于对称PNDI-2HD获得的4.30％。这种改善可以归因于电荷载流子迁移率的提高和有利的膜形态的形成。这些观察结果表明，结合不同侧链的分子设计策略可以为开发n型共轭聚合物提供一种新的有前途的方法。

更新日期：2018-02-13

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