Halogen-Free Donor Polymers Based on Dicyanobenzotriazole with Low Energy Loss and High Efficiency in Organic Solar Cells

被引:16
作者
Wang, Lei [1 ]
Zhang, Lifu [2 ]
Kim, Seoyoung [3 ]
Wang, Tingting [1 ]
Yuan, Zhongyi [1 ]
Yang, Changduk [4 ,5 ]
Hu, Yu [1 ]
Zhao, Xiaohong [1 ]
Chen, Yiwang [1 ,2 ]
机构
[1] Nanchang Univ, Coll Chem & Chem Engn, Inst Polymers & Energy Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China
[2] Jiangxi Normal Univ, Natl Engn Res Ctr Carbohydrate Synth, Key Lab Fluorine & Silicon Energy Mat & Chem, Minist Educ, 99 Ziyang Ave, Nanchang 330022, Jiangxi, Peoples R China
[3] Ulsan Natl Inst Sci & Technol UNIST, Low Dimens Carbon Mat Ctr, Perovtron Res Ctr, Sch Energy & Chem Engn, 50 UNIST Gil, Ulsan 44919, South Korea
[4] Ulsan Natl Inst Sci & Technol UNIST, Low Dimens Carbon Mat Ctr, Perovtron Res Ctr, Dept Energy Engn,Sch Energy & Chem Engn, 50 UNIST Gil, Ulsan 44919, South Korea
[5] Ulsan Natl Inst Sci & Technol UNIST, Grad Sch Carbon Neutral, 50 UNIST Gil, Ulsan 44919, South Korea
基金
中国国家自然科学基金;
关键词
dicyanobenzotriazole; halogen-free semiconductors; low energy loss; organic solar cells; ternary copolymers; OPEN-CIRCUIT-VOLTAGE; A TYPE POLYMERS; PHOTOVOLTAIC CELLS; PERFORMANCE; MORPHOLOGY; STABILITY; UNIT;
D O I
10.1002/smll.202206607
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Halogenation of organic semiconductors is an efficient strategy for improving the performance of organic solar cells (OSCs), while the introduction of halogens usually involves complex synthetic process and serious environment pollution problems. Herein, three halogen-free ternary copolymer donors (PCNx, x = 3, 4, 5) based on electron-withdrawing dicyanobenzotriazole are reported. When blended with the Y6, PCN3 with strong interchain interactions results in appropriate crystallinity and thermodynamic miscibility of the blend film. Grazing-incidence wide-angle X-ray scattering measurements indicate that PCN3 has more ordered arrangement and stronger pi-pi stacking than previous PCN2. Fourier-transform photocurrent spectroscopy and external quantum efficiency of electroluminescence measurements show that PCN3-based OSCs have lower energy loss than PCN2, which leads to their higher open-circuit voltage (0.873 V). The device based on PCN3 reaches power conversion efficiency (PCE) of 15.33% in binary OSCs, one of the highest values for OSCs with halogen-free donor polymers. The PCE of 17.80% and 18.10% are obtained in PM6:PCN3:Y6 and PM6:PCN3:BTP-eC9 ternary devices, much higher than those of PM6:Y6 (16.31%) and PM6:BTP-eC9 (17.33%) devices. Additionally, this ternary OSCs exhibit superior stability compared to binary host system. This work gives a promising path for halogen-free donor polymers to achieve low energy loss and high PCE.
引用
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页数:11
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