有机太阳能电池
掺杂剂
材料科学
图层(电子)
能量转换效率
活动层
逐层
带隙
接受者
纳米技术
电子迁移率
光电子学
兴奋剂
化学工程
聚合物
薄膜晶体管
复合材料
物理
凝聚态物理
工程类
作者
Qiaoling Chen,Ziqing Bian,Yujie Yang,Xinyue Cui,Charles Jeffreys,Xinjun Xu,Wenhua Li,Yuqiang Liu,Martin Heeney,Zhishan Bo
标识
DOI:10.1002/anie.202405949
摘要
Abstract Layer‐by‐layer (LbL) deposition of active layers in organic solar cells (OSCs) offers immense potential for optimizing performance through precise tailoring of each layer. However, achieving high‐performance LbL OSCs with distinct solid additives in each layer remains challenging. In this study, we explore a novel approach that strategically incorporates different solid additives into specific layers of LbL devices. To this end, we introduce FeCl 3 into the lower donor (D18) layer as a p‐type dopant to enhance hole concentration and mobility. Concurrently, we incorporate the wide‐band gap conjugated polymer poly(9,9‐di‐n‐octylfluorenyl‐2,7‐diyl) (PFO) into the upper acceptor (L8‐BO) layer to improve the morphology and prolong exciton lifetime. Unlike previous studies, our approach combines these two strategies to achieve higher and more balanced electron and hole mobility without affecting device open‐circuit voltage, while also suppressing charge recombination. Consequently, the power conversion efficiency (PCE) of the D18+FeCl 3 /L8‐BO device increases to 18.12 %, while the D18/L8‐BO+PFO device attains a PCE of 18.79 %. These values represent substantial improvements over the control device′s PCE of 17.59 %. Notably, when both FeCl 3 and PFO are incorporated, the D18+FeCl 3 /L8‐BO+PFO device achieves a remarkable PCE of 19.17 %. In summary, our research results demonstrate the effectiveness of the layered solid additive strategy in improving OSC performance.
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