Achieving stable organic solar cells with 19.2 % efficiency via fine interpenetrating network with fused-ring aromatic lactone donor

Wang，Jiangfeng1; Liu，Zhixin1; Xu，Jianpeng1; Zhang，Ying2; Peng，Wenbo1; Zhu，Peide1; Xu，Yintai2; Zeng，Jie1; Wang，Deng1; Zhang，Yong1; Wang，Xingzhu1,3,4; Yan，Lei2; Xu，Baomin1

2024-12-01

10.1016/j.nanoen.2024.110246

Nano Energy   影响因子和分区

2211-2855

The ternary strategy has enhanced the power conversion efficiency (PCE) of organic solar cells. However, long-term stability remains a challenge due to heat-induced molecular interactions and excessive self-aggregation. The fused-ring aromatic lactone (FAL) unit, with its extended molecular plane and electron-withdrawing ability, acts as an ideal building block in our newly designed donor P35. By introducing P35 into PM6:L8-BO systems, it optimizes film morphology and enhances π-π stacking, facilitating phase separation and balancing charge transport channels. The electron-withdrawing capability of P35 lowers the HOMO levels, thereby decreasing non-radiative recombination. Additionally, the extended molecular plane of P35 provides structural support to prevent the collapse of fiber-like PM6 and crosslinks with PM6 to form a thermodynamically stable interpenetrating network. This effectively limits the formation of isolated SMA islands, thereby minimizing the degeneration of the active layer. Consequently, an optimized PCE of 19.2 % (certified 18.55 %) is achieved in the PM6:P35:L8-BO devices, which still retains 80 % initial PCE under 600 h of AM 1.5 G illumination and 90 % PCE after 950 h storage in darkness. This research emphasizes the importance of electron-withdrawing capabilities and extended molecular planes in achieving long-term stability and high efficiency.

Aromatic lactone High efficiency Polymer donor Stability Ternary organic solar cell

英语

第一 ; 通讯

2-s2.0-85203509154

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Physics and Optoelectronics,Xiangtan University,Xiangtan,411105,China
3.Shenzhen Putai Technology Co.,Ltd,Shenzhen,518110,China
4.The Engineering and Research Center for Integrated New Energy Photovoltaics and Energy Storage Systems of Hunan Province and School of Electrical Engineering,University of South China,Hengyang,421001,China

Wang，Jiangfeng,Liu，Zhixin,Xu，Jianpeng,等. Achieving stable organic solar cells with 19.2 % efficiency via fine interpenetrating network with fused-ring aromatic lactone donor[J]. Nano Energy,2024,131.

Wang，Jiangfeng.,Liu，Zhixin.,Xu，Jianpeng.,Zhang，Ying.,Peng，Wenbo.,...&Xu，Baomin.(2024).Achieving stable organic solar cells with 19.2 % efficiency via fine interpenetrating network with fused-ring aromatic lactone donor.Nano Energy,131.

Wang，Jiangfeng,et al."Achieving stable organic solar cells with 19.2 % efficiency via fine interpenetrating network with fused-ring aromatic lactone donor".Nano Energy 131(2024).