材料科学
太阳能电池
光活性层
聚合物
接受者
富勒烯
载流子
有机太阳能电池
聚合物太阳能电池
能量转换效率
分子
光伏系统
化学工程
有机电子学
混合太阳能电池
化学物理
光电子学
有机化学
复合材料
化学
工程类
晶体管
电压
生态学
物理
生物
量子力学
凝聚态物理
作者
Chuanhang Guo,Yiwei Fu,Donghui Li,Liang Wang,Bojun Zhou,Chen Chen,Jing Zhou,Yaru Sun,Zhong-Ru Gan,Dan Liu,Wei Li,Tao Wang
标识
DOI:10.1002/adma.202304921
摘要
Organic semiconductors are generally featured with low structure order in solid-state films, which leads to low charge-transport mobility and strong charge recombination in their photovoltaic devices. In this work, a "polycrystal-induced aggregation" strategy orders the polymer donor (PM6) and non-fullerene acceptor (L8-BO) molecules during solution casting with the assistance of PM6 polycrystals that are incubated through a vapor diffusion method, toward improved solar cell efficiency with either thin or thick photoactive layers. These PM6 polycrystals are redissolved in chloroform to prepare PM6 pre-aggregates (PM6-PA), and further incorporated into the conventional PM6:L8-BO blend solutions, which is found to prolong the molecular organization process and enhance the aggregation of both the PM6 and the L8-BO components. As the results, with the assistance of 10% PM6-PA, PM6:L8-BO solar cell devices obtain power conversion efficiencies (PCEs) from 18.0% and 16.2% to 19.3% and 17.2% with a 100 nm-thick and 300 nm-thick photoactive layer, respectively.
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