Synthesis and photovoltaic property of terpolymers containing benzodithiophene, phenanthrophenazine and benzothiadizole with a changing subtituents
作者单位：College of Chemistry Xiangtan University Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences
会议名称：《第二届新型太阳能电池学术研讨会》
会议日期：2015年
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：the Major Cultivation and General Programs of the National Natural Science Foundation of China (91233112 21172187 51403178)
关 键 词：Benzodithiophene Phenanthrophenazine Benzothiadiazole Polymer solar cell
摘 要：Three novel donor-acceptor(D-A) type random terpolymers of PBDTT-PPz BT-H, PBDTT-PPz BT-F and PBDTT-PPz BT-O were synthesized by copolymerizing electron-rich 5,8-di alkylthienyl substituted benzodithiophene(BDTT) and two electron-deficient phenanthrophenazine(PPz) and benzothiadiazole(BT) units. By changing the substituents at 5,6-positions of BT, their optoelectronic properties were rationally adjusted for application as donor materials in polymer solar cells(PSCs). The maximum power conversion efficiency(PCE) of 6.3% was obtained with an open-circuit voltage(V) of 0.75 V, a short-circuit current(J-sc) of 13.0 mA cm and a fill factor(FF) of 64.8% in the PBDTT-PPz BT-O based PSCs using PC71 BM as an acceptor, which is much higher than those PCE values in the PBDTT-PPz BT-H and PBDTT-PPz BT-F based devices. To the best of our knowledge, these are the highest recorded maximum PCE, Jsc and FF values obtained to date compared with previously reported phenazine copolymeric derivatives in BHJ-PSCs.[1-4] This work illustrated the potential of these random conjugated terpolymers as promising donor materials in the application of PSCs.