材料科学
接受者
活动层
聚合物太阳能电池
堆积
化学物理
聚合物
能量转换效率
有机太阳能电池
共轭体系
化学工程
纳米技术
图层(电子)
光电子学
有机化学
化学
薄膜晶体管
物理
工程类
复合材料
凝聚态物理
作者
Zezhou Liang,Lihe Yan,Ning Wang,Jinhai Si,Shujuan Liu,Yufei Wang,Junfeng Tong,Jianfeng Li,Baofeng Zhao,Chao Gao,Xun Hou
标识
DOI:10.1002/adfm.202310312
摘要
Abstract Controlled sequential crystallization of donors and acceptors is a critical factor for achieving enhanced phase separation and efficient charge transfer performance in polymer solar cells (PSCs). In this study, a comprehensive investigation of a structurally simple solvent additive, 1‐fluoro‐2‐iodobenzene (OFIB) is conducted, which efficiently controls the morphology of the active layer, resulting in fibrous assembly and significantly enhancing the power conversion efficiency from 16.34% to 18.38% based on the PM6:L8‐BO system. Density functional theory, molecular dynamics simulations, and grazing incidence small‐ and wide‐angle X‐ray scattering techniques reveal that the addition of OFIB to the processed blend aligns the orientation of the acceptor molecules, thereby enhancing the overall π–π stacking in the active layer. OFIB establishes nearly equal‐strength π–π interactions with the conjugated frameworks of both the donor and acceptor materials, benefiting from the multiple electron conjugation between its iodine atom and the conjugated framework in the active layer. Femtosecond‐timescale photophysical studies demonstrate that the OFIB‐optimized active layer shows reduced exciton losses at the donor–acceptor interface. This study offers a new perspective on the mechanism underlying the function of solvent additives and presents a comprehensive research methodology that will guide the development of next‐generation non‐fullerene acceptors for efficient PSCs.
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