材料科学
接受者
带隙
聚合物
光电流
有机太阳能电池
聚合物太阳能电池
电子受体
轨道能级差
光电子学
光化学
分子
有机化学
化学
复合材料
物理
凝聚态物理
作者
Huiliang Sun,Yu Han,Yongqiang Shi,Jianwei Yu,Zhongxiang Peng,Xianhe Zhang,Bin Liu,Junwei Wang,Ranbir Singh,Jawon Lee,Yongchun Li,Zixiang Wei,Qiaogan Liao,Zhipeng Kan,Long Ye,He Yan,Feng Gao,Xugang Guo
标识
DOI:10.1002/adma.202004183
摘要
Abstract Narrow‐bandgap polymer semiconductors are essential for advancing the development of organic solar cells. Here, a new narrow‐bandgap polymer acceptor L14, featuring an acceptor–acceptor (A–A) type backbone, is synthesized by copolymerizing a dibrominated fused‐ring electron acceptor (FREA) with distannylated bithiophene imide. Combining the advantages of both the FREA and the A–A polymer, L14 not only shows a narrow bandgap and high absorption coefficient, but also low‐lying frontier molecular orbital (FMO) levels. Such FMO levels yield improved electron transfer character, but unexpectedly, without sacrificing open‐circuit voltage ( V oc ), which is attributed to a small nonradiative recombination loss ( E loss,nr ) of 0.22 eV. Benefiting from the improved photocurrent along with the high fill factor and V oc , an excellent efficiency of 14.3% is achieved, which is among the highest values for all‐polymer solar cells (all‐PSCs). The results demonstrate the superiority of narrow‐bandgap A–A type polymers for improving all‐PSC performance and pave a way toward developing high‐performance polymer acceptors for all‐PSCs.
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