Fluorination-modulated end units for high-performance non-fullerene acceptors based organic solar cells
Fluorination-modulated end units for high-performance non-fullerene acceptors based organic solar cells
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DOI：
10.1007/s40843-019-9415-2
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
Yanna Sun;Huan-huan Gao;Y. Yi;Xiangjian Wan;Huanran Feng;Xin Ke;Yamin Zhang;Jing Yan;Chenxi Li-Che
中科院分区：
文献类型：
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作者：
Yanna Sun;Huan-huan Gao;Y. Yi;Xiangjian Wan;Huanran Feng;Xin Ke;Yamin Zhang;Jing Yan;Chenxi Li-Che
Organic solar cells (OSCs) have drawn great attention for their low cost, light weight, solution processability and flexibility [1–3]. Over the last decade, fullerene and their derivatives have been the dominant electron acceptors for OSCs due to their excellent electron-transport properties, but limited by their disadvantages of poor light absorption, high synthesis cost, and difficulties in property tunability. To tackle these issues, design and synthesis of non-fullerene acceptors (NFAs) have received extensive attention and are urgently needed to explore for enhanced photovoltaic performance [4–9]. Among all the types of NFAs, acceptor-donor-acceptor (ADA) architecture based non-fullerene small molecule acceptors (NF-SMAs) shows tremendous potentials [10–13] and has achieved great advances for their excellent performance with power conversion efficiencies (PCEs) over 14% for single junction cells [14–18] and over 17% for tandem cells [19].The giant success of ADA backboned NF-SMAs is mainly due to their well-defined chemical structures, easily tuned energy levels and facile synthetic procedures [20–32]. In previous studies, through delicately modulating the NF-SMAs, the high efficiency of non-fullerene organic photovoltaiscs (OPVs) has been obtained [33–38]. As such, it is believed that there is a facile and effective way to finely tune properties of NFAs and further significantly enhance OPVs performance. The ADA backboned NF-SMAs mainly consisted of three segments: ladder-type electron-donating core, electron-withdrawing end units and outstretched side chains. Thus, modification of the above three components is an effective approach to obtain tunable energy levels, optical absorption,
