Exceeding 20.2% Efficiency in Pseudo‐Planar Heterojunction Organic Solar Cells Enabled by High‐Crystallinity L8‐BO‐C 4 ‐Induced Morphology Optimization
Chao Zhang·Qianqian Sun·Lijuan Wei·Jie Chi·Ran Dong·Shulin Han·Hang Zhou·Jinjuan Gao·Yujie Xu·Lei Cai·Xiaoyan Du·Jian Wang·Fujun Zhang·Tengfei Han
ABSTRACT Optimizing the morphology of the active layer via the incorporation of a sui` third component is crucial for enhancing the device performance of organic solar cells (OSCs). In this study, a third component L8‐BO‐C 4 is introduced into the D18/L8‐BO pseudo‐planar heterojunction (P‐PHJ) system to prepare P‐PHJ OSCs. L8‐BO‐C 4 and L8‐BO share akin chemical structures, but L8‐BO‐C 4 exhibits significantly higher crystallinity compared to L8‐BO, which is achieved through precise control of t