材料科学
活动层
阴极
有机太阳能电池
二亚胺
结晶度
能量转换效率
化学工程
热稳定性
兴奋剂
光电子学
图层(电子)
纳米技术
有机化学
复合材料
聚合物
物理化学
分子
薄膜晶体管
工程类
化学
苝
作者
Zongtao Wang,Helin Wang,Mengzheng Du,Xue Lai,Feng He,Qing Guo,Qiang Guo,Ailing Tang,Xiangnan Sun,Erjun Zhou
标识
DOI:10.1002/adfm.202313240
摘要
Abstract A fused naphthodithiophene diimide (NDTI) derivative is first used as cathode interlayer materials (CIMs) in organic solar cells, by introducing two dimethylamine‐functionalized fluorenes on both sides, namely NDTI1 . Meanwhile, two non‐fused naphthalene diimide (NDI) derivatives are synthesized as the control CIMs to validate the design strategy of fused NDI. All three CIMs show high thermal stability, robust adhesion, and strong electrode modification capability. Compared with two NDI‐based materials, NDTI1 possesses excellent film‐forming capacity and strong crystallinity, simultaneously. Besides, NDTI1 presents a strong self‐doping effect and distinct intermolecular interaction with non‐fullerene acceptors. As expected, the NDTI1 ‐based OSCs achieve a power conversion efficiency (PCE) of 18.02% using the PM6:Y6 active layer and a champion PCE of 19.01% employing the active layer PM6:L8‐BO, which is attributed to improve charge transport and extraction, and suppressive charge recombination. More importantly, NDTI1 retains 91% of the optimal PCE when the film thickness increases from 7 to 20 nm. Furthermore, NDTI1 also exhibits satisfactory universality for different active layer materials and excellent device stability.
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