Achieving High-Efficiency and Thick-Film-Insensitive Organic Solar Cells with a Functional Aid
Ruizhi Zhang , Linghui Qi , Maoheng Wu , Bing Sun , Longfei Jia , Jiaqi Hu , Chengcheng Li , Sunsun Li , Lina Zhou , Vakhobjon Kuvondikov , Sherzod Nematov , Changlei Xia , Wenchao Zhao , Long Ye
Chinese Journal of Chemistry ›› 2026, Vol. 44 ›› Issue (2) : 268 -276.
Presently, few methods offer broad applicability for optimizing thick-film organic solar cells (OSCs). Here, we identify and implement a functional aid, 4-iodobiphenyl (IBP), in OSCs to optimize active layer morphology and significantly boost device efficiency. In the PM6:A4T-16 system, the optimized volatility of IBP promotes acceptor recrystallization and ordered molecular alignment during thermal annealing, leading to the formation of large aggregates and a fibrous morphology that facilitates efficient charge transport. As a result, the power conversion efficiency (PCE) of IBP-treated devices increases by 20% compared with those using conventional additives such as DIO and DIB. Notably, IBP exhibits broad compatibility, delivering substantial efficiency enhancements in PM6:BTP-eC9 and PM6:D18:L8-BO systems, with the latter reaching a high PCE of 20%. Furthermore, IBP enables thickness-insensitive performance, maintaining a PCE of ~17% at an active layer thickness exceeding 360 nm. These results demonstrate IBP as a highly effective processing aid for multiple donor:acceptor pairs, offering a promising strategy for morphology engineering and advancing the fabrication of high-performance OSCs.
Organic solar cells / Non-fullerene acceptor / Solid additives / Morphology / Power conversion efficiency
2025 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
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