基于双噻吩酰亚胺聚合物给体的侧链调控与光伏性能研究  

Alkyl Chain Engineering of Bithiophene Imide-based Polymer Donor for Organic Solar Cells

作　　者：白原青 张佳滨 刘春晨 胡志诚[1] 张凯[1] 黄飞[1] BAI Yuanqing#;ZHANG Jiabin#;LIU Chunchen*;HU Zhicheng;ZHANG Kai;HUANG Fei(Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学发光材料与器件国家重点实验室,高分子光电材料与器件研究所,广州510640

出　　处：《高等学校化学学报》2023年第9期242-252,共11页Chemical Journal of Chinese Universities

基　　金：国家重点研发计划项目(批准号:2019YFA0705900);广东省基础与应用基础研究重点项目(批准号:2019B030302007);国家自然科学基金(批准号:U21A6002);粤港澳光电磁功能材料联合实验室(批准号:2019B121205002)资助。

摘　　要：采用苯并二噻吩(BDT)作为给电子单元,分别与具有2-乙基己基和甲基侧链的双噻吩酰亚胺(BTI)缺电子单元共聚构筑了两个聚合物给体材料(pBDT-BTI-EH和pBDT-BTI-ME).与pBDT-BTI-EH∶Y6相比,基于p BDT-BTI-ME∶Y6的器件具有更高的电荷迁移率、更低的载流子复合、更高的激子解离以及更优的薄膜形貌,从而获得了更高的短路电流密度(J_(SC))和填充因子(FF),电池的能量转换效率由9.31%提高到15.69%.Two polymer donor materials,namely pBDT-BTI-EH and pBDT-BTI-ME,were synthesized by copoly-merizing benzodithiophene(BDT)unit with bithiophene imide(BTI)unit containing 2-ethylhexyl and methyl alkyl side chains,respectively.Compared to pBDT-BTI-EH∶Y6 based organic solar cells(OSCs),the pBDT-BTI-ME∶Y6-based device exhibited higher charge mobilities,reduced charge recombination,more efficient exciton dissociation,and favorable film morphology,which leaded to increased short current density(Jsc),fill factor(FF)and thus a significant improvement in power conversion efficiency(PCE)from 9.31%to 15.69%.

关 键 词：有机太阳电池 聚合物给体 双噻吩酰亚胺 侧链调控 

分 类 号：O631[理学—高分子化学]