Charge Mobility Enhancement for Conjugated DPP-Selenophene Polymer by Simply Replacing One Bulky Branching Alkyl Chain with Linear One at Each DPP Unit
作者:Zhijie Wang、Zitong Liu、Lu Ning、Mingfei Xiao、Yuanping Yi、Zhengxu Cai、Aditya Sadhanala、Guanxin Zhang、Wei Chen、Henning Sirringhaus、Deqing Zhang
DOI:10.1021/acs.chemmater.8b01007
日期:2018.5.8
DPP-based conjugated D-A polymers. This approach involves the replacement of one bulky branching alkyl chain with the linear one at each DPP unit in regular polymer PDPPSe-10 and PDPPSe-12. The UV–vis absorption, Raman spectra, PDS data, and theoretical calculations support that the replacement of bulky branching chains with linear ones can weaken the steric hindrance, and accordingly conjugated backbones
我们展示了一种简单但有效的方法来改善基于DPP的共轭DA聚合物的半导体性能。此方法涉及在常规聚合物PDPPSe-10和PDPPSe-12中的每个DPP单元上,用直链取代一个庞大的支链烷基链。紫外可见吸收,拉曼光谱,PDS数据和理论计算均支持用线性支链取代笨重的支链会削弱空间位阻,因此,共轭主链变得更加平坦和刚性。GIWAXS数据显示,PDPPSe-10和PDPPSe-12中掺入线性烷基链有利于侧链互指和链间致密堆积,与含支链的PDPPSe相比,可改善链间堆积顺序和薄膜结晶度烷基链。根据场效应晶体管(FET)的研究,PDPPSe-10和PDPPSe-12的电荷迁移率显着提高。PDPPSe-10和PDPPSe-12在空气中的空穴迁移率提高到8.1和9.4 cm2 V –1 s –1,分别是PDPPSe(1.35 cm 2 V –1 s –1)的6倍和7倍。此外,PDPPSe-10和PDPPSe