Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials & Devices , South China University of Technology , Guangzhou 510640 , P. R. China.
School of Materials Science & Engineering , Wuhan Institute of Technology , Wuhan 430205 , P. R. China.
ACS Appl Mater Interfaces. 2018 Apr 4;10(13):11094-11100. doi: 10.1021/acsami.8b03643. Epub 2018 Mar 21.
A 5,6-difluorobenzothiazole-based dibromo monomer was successfully synthesized, from which new fluorinated conjugated polymers PF-ffBTz and PFN-ffBTz were prepared via copolymerizations with two fluorene-based diboronic ester monomers. Twisted fluorene-ffBTz backbones enable PF-ffBTz and PFN-ffBTz with large band gaps up to 3.10 eV and deep-lying highest occupied molecular orbital levels down to -6.2 eV. The chemical structures of PF-ffBTz and PFN-ffBTz impart some new functionalities of fluorinated conjugated polymers. PF-ffBTz can show deep blue electroluminescent emission, with high external quantum efficiency of 3.71%. PFN-ffBTz, with amino-functionalized side chains on the fluorene unit, can serve as an efficient cathode interlayer in inverted polymer solar cells (PSCs), showing better photovoltaic performances if compared with a ZnO interlayer. In addition, it is found that using an optical filter to cut off the short wavelength section (≤380 nm) of incident light can significantly elevate photostability of PSCs under continuous illumination.
成功合成了一种基于 5,6-二氟苯并噻唑的二溴单体，通过与两种基于芴的二硼酸酯单体的共聚反应，制备了新型氟化共轭聚合物 PF-ffBTz 和 PFN-ffBTz。扭曲的芴-ffBTz 骨架使 PF-ffBTz 和 PFN-ffBTz 具有高达 3.10eV 的大带隙和深达-6.2eV 的最高占据分子轨道能级。PF-ffBTz 和 PFN-ffBTz 的化学结构赋予了氟化共轭聚合物一些新的功能。PF-ffBTz 可以显示深蓝色电致发光发射，外量子效率高达 3.71%。PFN-ffBTz 在芴单元上具有氨基官能化侧链，可用作倒置聚合物太阳能电池 (PSC) 的高效阴极界面层，如果与 ZnO 界面层相比，其光电性能更好。此外，发现使用光学滤波器切断入射光的短波长部分（≤380nm）可以显著提高连续光照下 PSC 的光稳定性。
