Rationally pairing photoactive materials for high-performance polymer solar cells with efficiency of 16.53%
Yue Wu1 , Yan Zheng1 , Hang Yang1 , Chenkai Sun2 , Yingying Dong1 , Chaohua Cui1*（崔超华）, He Yan3 & Yongfang Li1,2*（李永舫）
1 Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
2 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
3 Department of Chemistry, Energy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong, China
Sci China Chem (2020) 63 (2) 265--271
The emergence of non-fullerene acceptors (NFA) offers a promising opportunity to develop high-performance donor/acceptor pairs with high power conversion efficiency, as NFAs offer tunable energy levels, broad absorption and suitable aggregation property. In order to enhance light-harvesting capability of active layers, we choose a wide bandgap polymer PTQ10 as the donor to blend with a narrow bandgap NFA Y6 as the acceptor. In comparison with PTQ10:IDIC blend, ~130 nm red-shifted absorption spectrum is observed in the PTQ10:Y6 blend, which potentially enhance the short-circuit current density (Jsc) for the PSCs. In addition, the optimal PTQ10:Y6 blend shows higher photoluminescence quenching efficiency and more efficient charge separation, higher charge mobilities, as well as weaker bimolecular recombination over the PTQ10:IDIC blend, which leads to an outstanding power conversion efficiency (PCE) of 16.53%, with a notable Jsc of 26.65 mA cm−2 and fill factor (FF) of 0.751.