Oligothiophene-based small molecules with 3,3′-difluoro-2,2′-bithiophene central unit for solution-processed organic solar cells

Kan Bin Zhang Qian Wan Xiangjian Ke Xin Wang Yunchuang Feng Huanran Zhang Mingtao Chen Yongsheng · 2016

阅读量：305

氟中央单元

期刊名称：

Organic Electronics: physics, materials, applications 2016 年 38 卷

发表日期：

2016.11.01

摘要：

Two new oligothiophene-based small molecules, namely DRCN6T-F and DRCN8T-F, with 3,3???-difluoro-2,2???-bithiophene as the central building block and 2-(1,1-dicyanomethylene)-rhodanine as end groups, were designed and synthesized. Compared to their non-fluorinated counterparts DRCN6T and DRCN8T, DRCN6T-F and DRCN8T-F exhibit enhanced intermolecular interactions and lower HOMO energy levels. However, PCEs of 2.26% and 5.07% were obtained for DRCN6T-F and DRCN8T-F based optimized devices, respectively, lower than those of non-fluorinated molecules DRCN6T and DRCN8T. The relatively poor performance for the DRCN6T-F and DRCN8T-F were mainly caused by their low short-circuit current densities, due to their unfavorable morphologies and low charge carrier mobilities.