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	Isomeric acceptors incorporation enables 18.1% efficiency ternary organic solar cells with reduced trap-assisted charge recombination
	Lv, Jie1,2,3; Yang, Qianguang4; Deng, Wanyuan5; Chen, Haiyan4; Kumar, Manish6; Zhao, FuQing4; Lu, Shirong1; Hu, Hanlin3; Kan, Zhipeng2
	2023-06-01
摘要	The donor-acceptor miscibility is one of the most critical factors in controlling the active layer morphologies with multiple components. However, how to practically select the third component with the desired miscibility for efficient ternary organic solar cells remains unresolved. Herein, we demonstrate that the surface energy of thin films could be manipulated by altering the weight ratios of the isomeric acceptors in the blend films and, therefore, the regulation of donor-acceptor miscibility. When the acceptor weight ratio (M- Cl:O-Cl) is 1:0.3, low miscibility (chi = 5.43 x 10-2K) with PM6 is achieved, and the power conversion efficiency of organic solar cells composed of PM6:M-Cl (17.1%) is enhanced to 18.1% (PM6:M-Cl:O-Cl). The increased power conversion ef-ficiency resulted from the surface energy-driven active layer morphology and donor-acceptor phase separations, associated with the significantly lower energetic disorder, trap density, and thus reduced free charge recombi-nation. Our findings underline the significance of the isomeric approach to managing the blend film surface energy and, therefore, the donor-acceptor miscibility for improving the device performance, providing guide-lines for the fabrication of high-performed ternary OSCs and material designs.
关键词	Organic solar cells Surface energy Miscibility Ternary Trap density
DOI	10.1016/j.cej.2023.142822
发表期刊	CHEMICAL ENGINEERING JOURNAL
ISSN	1385-8947
卷号	465页码:10
通讯作者	Lu, Shirong(lushirong@cigit.ac.cn) ; Hu, Hanlin(hanlinhu@szpt.edu.cn) ; Kan, Zhipeng(kanzhipeng@gxu.edu.cn)
收录类别	SCI
WOS记录号	WOS:000984548400001
语种	英语