平面度测试
四聚体
能量转换效率
有机太阳能电池
低聚物
光致发光
化学工程
聚合物太阳能电池
化学
材料科学
化学物理
光电子学
高分子化学
结晶学
复合材料
有机化学
聚合物
工程类
酶
作者
Rui Zeng,Jiawei Deng,Xiaonan Xue,Senke Tan,Lixuan Kan,Lin Yi,Wenkai Zhong,Lei Zhu,Qianqian Zhang,Yuhao Zhou,Xingyu Gao,Ming Zhang,Yongming Zhang,Shengjie Xu,Feng Liu,Shengjie Xu,Feng Liu
出处
期刊:Angewandte Chemie
[Wiley]
日期:2025-01-02
卷期号:64 (8): e202420453-e202420453
被引量:21
标识
DOI:10.1002/anie.202420453
摘要
Thanks to the development of non-fullerene acceptor (NFA) materials, the photovoltaic conversion efficiency (PCE) of organic solar cells (OSCs) has exceeded 20 %, which has met the requirements for commercialisation. In the current stage, the main focus is to balance the performance and stability. It has been shown that all-polymer formulation can improve device stability, however, PCE is not in satifsfaction, and the batch-to-batch variation leads to quality control issues. In this work, we constructed monodispersed tetramer NFA materials named G-1 and G-2, to best integrate the merits of small molecule and polymer. Density functional theory (DFT) calculations and experimental results showed that different connecting units at the centre could significantly affect the molecular planarity and thin film morphology. The alkene-bonded tetramer G-1 had a more regioregular structure, which leads to better molecular planarity, and more ordered packing in thin film. More importantly, the oligomeration induced a favourable face-on orientation, achieved a lower binding energy and exhibited a higher photoluminescence yield. As a result, the exciton and charge carrier kinetics was optimized with reduced non-radiative energy loss. The OSC based on PM6 : G-1 achieved a PCE of 19.6 %, which is the highest PCE reported so far for oligomer-based binary OSC. In addition, the device stability was largely improved, showing a lifetime over 10000 hours in the inverted OSC device.
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