有机太阳能电池
沉积(地质)
材料科学
接受者
卤素
化学工程
太阳能电池
铸造
纳米技术
有机化学
化学
聚合物
光电子学
复合材料
烷基
古生物学
物理
沉积物
工程类
生物
凝聚态物理
作者
Siwei Luo,Chao Li,Jianquan Zhang,Xinhui Zou,Heng Zhao,Kan Ding,Hui Huang,Jinsheng Song,Jicheng Yi,Yu Han,Kam Sing Wong,Guangye Zhang,Harald Ade,Wei Ma,Huawei Hu,Yanming Sun,He Yan
标识
DOI:10.1038/s41467-023-41978-0
摘要
High-efficiency organic solar cells are often achieved using toxic halogenated solvents and additives that are constrained in organic solar cells industry. Therefore, it is important to develop materials or processing methods that enabled highly efficient organic solar cells processed by halogen free solvents. In this paper, we report an innovative processing method named auxiliary sequential deposition that enables 19%-efficiency organic solar cells processed by halogen free solvents. Our auxiliary sequential deposition method is different from the conventional blend casting or sequential deposition methods in that it involves an additional casting of dithieno[3,2-b:2',3'-d]thiophene between the sequential depositions of the donor (D18-Cl) and acceptor (L8-BO) layers. The auxiliary sequential deposition method enables dramatic performance enhancement from 15% to over 18% compared to the blend casting and sequential deposition methods. Furthermore, by incorporating a branched-chain-engineered acceptor called L8-BO-X, device performance can be boosted to over 19% due to increased intermolecular packing, representing top-tier values for green-solvent processed organic solar cells. Comprehensive morphological and time-resolved characterizations reveal that the superior blend morphology achieved through the auxiliary sequential deposition method promotes charge generation while simultaneously suppressing charge recombination. This research underscores the potential of the auxiliary sequential deposition method for fabricating highly efficient organic solar cells using environmentally friendly solvents.
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