Efficient non-fullerene polymer solar cells based on a wide bandgap polymer of meta-alkoxy-phenylsubstituted benzodithiophene and difluorobenzotriazole
Wanbin Li a, Guangda Li a, Xia Guo*a（国霞）, Bing Guo a, Zhaozhao Bi b, Huan Guo a, Wei Ma b, Xuemei Ou a, Maojie Zhang *a（张茂杰）and Yongfang Li ac
a Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
b State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
c CAS Research/Education Center for Excellence in Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
J. Mater. Chem. A, 2017, 5, 19680--19686
A new conjugated polymer (PBFZ-OP) based on meta-alkoxy-phenyl-substituted benzodithiophene (BDT-m-OP) and difluorobenzotriazole (FBTZ) was designed and synthesized for application as a donor material in non-fullerene polymer solar cells (PSCs). The polymer exhibits a strong absorption in the range of 300–620 nm with a wide bandgap of 1.99 eV, which is complementary to that of the small molecule acceptor ITIC. Meanwhile, it also possesses a deeper HOMO energy level of −5.33 eV and a higher hole mobility of 7.28 × 10−4 cm2 V−1 s−1. The PSCs based on PBFZ-OP:ITIC showed a higher power conversion efficiency (PCE) of 10.5% with a Voc of 0.91 V, Jsc of 18.7 mA cm−2, and FF of 61.8% in comparison with the PCE of 5.5% with a Voc of 0.73 V, Jsc of 13.1 mA cm−2, and FF of 57.8% for J52-based PSCs. The results indicate that PBFZ-OP is a promising wide bandgap polymer donor for the photovoltaic application in non-fullerene PSCs.
链接：http://pubs.rsc.org/en/content/articlelanding/2017/ta/c7ta06476d#!divAbstract