Xiao Mingfei, Carey Remington L, Chen Hu, Jiao Xuechen, Lemaur Vincent, Schott Sam, Nikolka Mark, Jellett Cameron, Sadhanala Aditya, Rogers Sarah, Senanayak Satyaprasad P, Onwubiko Ada, Han Sanyang, Zhang Zhilong, Abdi-Jalebi Mojtaba, Zhang Youcheng, Thomas Tudor H, Mahmoudi Najet, Lai Lianglun, Selezneva Ekaterina, Ren Xinglong, Nguyen Malgorzata, Wang Qijing, Jacobs Ian, Yue Wan, McNeill Christopher R, Liu Guoming, Beljonne David, McCulloch Iain, Sirringhaus Henning
Optoelectronics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
KSC, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Sci Adv. 2021 Apr 28;7(18). doi: 10.1126/sciadv.abe5280. Print 2021 Apr.
We investigate the charge transport physics of a previously unidentified class of electron-deficient conjugated polymers that do not contain any single bonds linking monomer units along the backbone but only double-bond linkages. Such polymers would be expected to behave as rigid rods, but little is known about their actual chain conformations and electronic structure. Here, we present a detailed study of the structural and charge transport properties of a family of four such polymers. By adopting a copolymer design, we achieve high electron mobilities up to 0.5 cm V s Field-induced electron spin resonance measurements of charge dynamics provide evidence for relatively slow hopping over, however, long distances. Our work provides important insights into the factors that limit charge transport in this unique class of polymers and allows us to identify molecular design strategies for achieving even higher levels of performance.
我们研究了一类此前未被识别的缺电子共轭聚合物的电荷传输物理特性，这类聚合物沿着主链不包含任何连接单体单元的单键，仅含双键连接。这类聚合物预计会表现得像刚性棒，但对其实际链构象和电子结构却知之甚少。在此，我们对四种此类聚合物的结构和电荷传输特性进行了详细研究。通过采用共聚物设计，我们实现了高达0.5 cm² V⁻¹ s⁻¹的高电子迁移率。然而，场致电子自旋共振对电荷动力学的测量结果表明，电荷在长距离上的跳跃相对较慢。我们的工作为限制这类独特聚合物中电荷传输的因素提供了重要见解，并使我们能够确定实现更高性能水平的分子设计策略。
