Enhanced power conversion efficiency in iridium complexbased terpolymers for polymer solar cells  

作　　者：Zhongyuan Xue Shifan Wang Jie Yang Yu Zhong Min Qian Cheng Li Zhiguo Zhang Guichuan Xing Sven Huettner Youtian Tao Yongfang Li Wei Huang 

机构地区：[1]Key Lab for Flexible Electronics&Institute of Advanced Materials,Jiangsu National Synergistic Innovation Center for Advanced Materials(SICAM),Nanjing Tech University,30 South Puzhu Road,Nanjing 211816,China [2]Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [3]Macromolecular Chemistry I,Universität Bayreuth,30 Universitätsstr,Bayreuth 95447,Germany [4]Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials,Nanjing University of Posts and Telecommunications,9 Wenyuan Road,Nanjing 210046,China

出　　处：《npj Flexible Electronics》2018年第1期1-7,共7页npj-柔性电子（英文）

基　　金：Research Program between China and European Union(2016YFE0112000);the Natural Science Foundation of Jiangsu Province(BK20160042)for financial support.

摘　　要：By introducing various low concentrations of Iridium complexes to the famous donor polymer of PTB7-Th backbone,new heavy metal containing terpolymers have been demonstrated.When blended with PC71BM,an obvious increase of power conversion efficiency(PCE)is obtained in 1 mol%Ir containing polymer for different photovoltaic devices either using Ca or PDIN as cathode interface layers.The impact of molecular weight on the photovoltaic performance has been particularly considered by using three batches of control polymer PTB7-Th to ensure a fair and more convincing comparison.At similar molecular weight conditions(Mn:~60 kg mol−1,M_(w):100-110 kg mol^(−1)),the 1 mol%Ir containing PTB7-ThIr1/PC71BM blends exhibits enhanced PCE to 9.19%compared with 7.92%of the control PTB7-Th.Through a combination of physical measurement,such as optoelectrical characterization,GIWAXS and pico-second time-resolved photoluminescence,the enhancement are contributed from comprehensive factors of higher hole mobility,less bimolecular recombination and more efficient slow process of charge separation.

关 键 词：POLYMER BACKBONE DONOR 

分 类 号：O62[理学—有机化学]