Trifluoromethyl-Substituted Conjugated Random Terpolymers Enable High-Performance Small and Large-Area Organic Solar Cells Using Halogen-Free Solvent

被引:6
|
作者
Rehman, Zia Ur [1 ,2 ]
Haris, Muhammad [1 ,2 ]
Ryu, Seung Un [3 ]
Jahankhan, Muhammad [1 ,2 ]
Song, Chang Eun [1 ,2 ]
Lee, Hang Ken [1 ]
Lee, Sang Kyu [1 ,2 ]
Shin, Won Suk [1 ,2 ]
Park, Taiho [3 ]
Lee, Jong-Cheol [1 ,2 ]
机构
[1] Korea Res Inst Chem Technol KRICT, Adv Energy Mat Res Ctr, Daejeon 34114, South Korea
[2] Univ Sci & Technol UST, Adv Mat & Chem Engn, Daejeon 34113, South Korea
[3] Pohang Univ Sci & Technol POSTECH, Dept Chem Engn, Gyeongsangbug Do 37673, Pohang, South Korea
基金
新加坡国家研究基金会;
关键词
halogen-free solvent; organic solar cells; random copolymerization; sub-module devices; trifluoromethyl-substitution; POLYMER;
D O I
10.1002/advs.202302376
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The advancement of non-fullerene acceptors with crescent-shaped geometry has led to the need for polymer donor improvements. Additionally, there is potential to enhance the photovoltaic parameters in high-efficiency organic solar cells (OSCs). The random copolymerization method is a straightforward and effective strategy to further optimize photoactive morphology and enhance device performance. However, finding a suitable third component in terpolymers remains a crucial challenge. In this study, a series of terpolymer donors (PTF3, PTF5, PTF10, PTF20, and PTF50) is synthesized by introducing varying amounts of the trifluoromethyl-substituted unit (CF3) into the PM6 polymer backbone. Even subtle changes in the CF3 content can significantly enhance all the photovoltaic parameters due to the optimized energy levels, molecular aggregation/miscibility, and bulk-heterojunction morphology of the photoactive materials. Thus, the best binary OSC based on the PTF5:Y6-BO achieves an outstanding power conversion efficiency (PCE) of 18.2% in the unit cell and a PCE of 11.6% in the sub-module device (aperture size: 54.45 cm(2)), when using halogen-free solvent o-xylene. This work showcases the remarkable potential of the easily accessible CF3 unit as a key constituent in the construction of terpolymer donors in high-performance OSCs.
引用
收藏
页数:10
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