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A Narrow-Bandgap n-Type Polymer with an Acceptor-Acceptor Backbone Enabling Efficient All-Polymer Solar Cells.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-09-21 , DOI: 10.1002/adma.202004183
Huiliang Sun 1, 2 , Han Yu 2 , Yongqiang Shi 1 , Jianwei Yu 3 , Zhongxiang Peng 4 , Xianhe Zhang 1 , Bin Liu 1 , Junwei Wang 1 , Ranbir Singh 5 , Jaewon Lee 6 , Yongchun Li 1 , Zixiang Wei 1 , Qiaogan Liao 1 , Zhipeng Kan 7 , Long Ye 4 , He Yan 2 , Feng Gao 3 , Xugang Guo 1
Affiliation  

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 (Voc), which is attributed to a small nonradiative recombination loss (Eloss,nr) of 0.22 eV. Benefiting from the improved photocurrent along with the high fill factor and Voc, 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.

中文翻译:

具有使能全聚合物太阳能电池的受体-受体主干的窄带隙n型聚合物。

窄带隙聚合物半导体对于促进有机太阳能电池的发展至关重要。在这里,一种新的窄带隙聚合物受体L14具有受体-受体(AA)型骨架,是通过将二溴化的稠环电子受体(FREA)与二甲氧基化的二噻吩酰亚胺共聚而合成的。结合FREA和A–A聚合物的优点,L14不仅显示出窄带隙和高吸收系数,而且还展现出较低的前沿分子轨道(FMO)水平。这样的FMO含量可改善电子传递特性,但出乎意料的是,不会牺牲开路电压(V oc),这是由于较小的非辐射复合损失(E loss,nr)为0.22 eV。得益于改进的光电流,高填充因子和V oc,实现了14.3%的出色效率,这是全聚合物太阳能电池(all-PSC)的最高值。结果表明窄带隙A–A型聚合物在改善全PSC性能方面的优越性,为开发用于全PSC的高性能聚合物受体铺平了道路。
更新日期:2020-10-26
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