High-efficiency organic solar cells enabled by an alcohol-washable solid additive  

作　　者：Yuanpeng Xie Hwa Sook Ryu Lili Han Yunhao Cai Xiaopeng Duan Donghui Wei Han Young Woo Yanming Sun 

机构地区：[1]School of Chemistry,Beihang University,Beijing,100191,China [2]Department of Chemistry,College of Science,KU-KIST Graduate School of Converging Science and Technology,Korea University,Seoul,136-713,Korea [3]College of Chemistry and Molecular Engineering,Zhengzhou University,Zhengzhou,450001,China

出　　处：《Science China Chemistry》2021年第12期2161-2168,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(52003013,21734001,51825301);China Postdoctoral Science Foundation(BX20190023);the financial support by the National Research Foundation(NRF)of Korea(2016M1A2A2940911,2019R1A6A1A11044070)。

摘　　要：The solvent additive strategy has been widely utilized to boost the power conversion efficiency(PCE)of organic solar cells(OSCs).However,the residual solvent additive in the active layer tends to induce a gradual morphology degradation and further influences the long-term stability of OSCs.Here,a solid additive,1,4-diiodobenzene(DIB),was introduced to fabricate efficient OSCs.We found that the treatment of DIB can lead to optimized morphology to form a bicontinuous network with intensified intermolecular packing in the donor and acceptor phases.Notably,DIB can be easily removed from the active layer via a simple alcohol washing process and no further post-thermal annealing is needed,which is desirable for large-scale manufacturing of OSCs.As a result,high efficiencies of 17.47%for PM6:Y6 and 18.13%(certified as 17.7%)for PM6:BTP-eC9 binary OSCs are achieved,which are among the highest efficiencies reported for binary OSCs thus far.Moreover,OSCs fabricated with DIB also exhibit superior stability compared with the as-cast and traditional solvent additive processed devices.Additionally,DIB was successfully applied in different active layers,manifesting its general applicability.This work provides a feasible approach to enhance both the efficiency and stability of OSCs.

关 键 词：organic solar cells solid additive alcohol washing process EFFICIENCY STABILITY 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ242.1[化学工程—有机化工]