Side-Chain Sequence Enabled Regioisomeric Acceptors for Conjugated Polymers
Side-Chain Sequence Enabled Regioisomeric Acceptors for Conjugated Polymers
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DOI：
10.1021/acs.macromol.8b01946
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发表时间：
2018-10
期刊：
影响因子：
5.5
通讯作者：
Xuyi Luo;D. Tran;Natalie M. Kadlubowski;Carr Hoi Yi Ho;P. Riley;F. So;Jianguo Mei
中科院分区：
文献类型：
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作者：
Xuyi Luo;D. Tran;Natalie M. Kadlubowski;Carr Hoi Yi Ho;P. Riley;F. So;Jianguo Mei
本文报道了在同一共轭主干上承载不同侧链序列的使能侧链序列的区域异构体受体。从这两种区域异构体受体合成了两种区域规则聚合物PTBI-1和PTBI-2，以及一种区域随机聚合物PTBI-3。UV-VIS-NIR吸收光谱和电化学研究证实了这三种聚合物在固体状态下的前线分子轨道能级相似。更有趣的是，吸收谱表明侧链的顺序在很大程度上控制着聚集行为。此外，AFM和GIWAXS测试表明，PtBI-2薄膜比PtBI-1和PtBI-3薄膜显示出更大的有序区。结果表明，基于PtBI-2的FET器件的平均空穴迁移率达到1.37cm2 V-1 S-1，远远高于具有其他侧链序列的两种聚合物。区域随机Ptbi-3的平均空穴迁移率最低，为0.27cm2 V-1 S-1。
Side-chain sequence enabled regioisomeric acceptors, bearing different side-chain sequences on the same conjugated backbone, are herein reported. Two regioregular polymers PTBI-1 and PTBI-2 and one regiorandom polymer PTBI-3 were synthesized from these two regioisomeric acceptors for a comparative study. UV–vis–NIR absorption spectroscopy and electrochemical study confirmed similar frontier molecular orbital levels of the three polymers in their solid state. More intriguingly, absorption profiles suggest that the sequence of side chains greatly governs the aggregation behaviors. Furthermore, the PTBI-2 film shows larger ordered domains than PTBI-1 and PTBI-3 films, as supported by AFM and GIWAXS measurements. As a result, PTBI-2-based FET devices achieved an average hole mobility of 1.37 cm2 V–1 s–1, much higher than the two polymers with other side-chain sequences. The regiorandom PTBI-3 exhibited the lowest average hole mobility of 0.27 cm2 V–1 s–1. This study highlights the significant impact of side-c...