Over 16% efficiency all-polymer solar cells by sequential deposition  

作　　者：Bangbang Li Xuanyu Zhang Ziang Wu Jie Yang Bin Liu Qiaogan Liao Junwei Wang Kui Feng Rui Chen Han Young Woo Fei Ye Li Niu Xugang Guo Huiliang Sun 

机构地区：[1]Department of Materials Science and Engineering,Southern University of Science and Technology(SUSTech),Shenzhen,518055,China [2]Center for Advanced Analytical Science,School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou,510006,China [3]Department of Electrical and Electronic Engineering,Southern University of Science and Technology(SUSTech),Shenzhen,518055,China [4]Department of Chemistry,Korea University,Seoul,136-713,Republic of Korea [5]Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,SUSTech,Shenzhen,518055,China

出　　处：《Science China Chemistry》2022年第6期1157-1163,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (52173172, 52173171, 21774055);the Natural Science Foundation for Distinguished Young Scholars of Guangdong Province (2021B1515020027);the Shenzhen Science and Technology Innovation Commission (JCYJ202103243104813035,JCYJ20180504165709042);the Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology);China Postdoctoral Science Foundation (2021M700062);the financial support from the Natural Research Foundation of Korea (2016M1A2A2940911, 2015M1A2A2057506);the support of the Guangdong Provincial Key Laboratory Program (2021B1212040001) from the Department of Science and Technology of Guangdong Province。

摘　　要：All-polymer solar cells(all-PSCs) have received extensive attention due to their excellent mechanical robustness and performance stability. However, the power conversion efficiency(PCE) of all-PSCs still lags behind those of organic solar cells(OSCs)based on non-fullerene small molecule acceptors. Herein, we report highly efficient all-PSCs via sequential deposition(SD) with donor and acceptor layers coated sequentially to optimize the film microstructure. Compared with the bulk heterojunction(BHJ)all-PSCs, an optimized morphology with vertical component distribution was achieved for the SD-processed all-PSCs due to the synergistic effect of swelling of polymer films and using additive. Such strategy involves using chlorobenzene as the first layer processing-solvent for polymer donor, chloroform as the second processing-solvent for polymer acceptor with trace 1-chloronaphthalene, efficiently promoting exciton dissociation and charge extraction and reducing trap-assisted recombination.Consequently, over 16% all-PSCs fabricated via SD method was realized for the first time, which is much higher than that(15.2%) of its BHJ counterpart and also among the highest PCEs in all-PSCs. We have further demonstrated the generality of this approach in various all-polymer systems. This work indicates that the SD method can yield excellent all-PSCs and provides a facile approach to fabricating high-performance all-PSCs.

关 键 词：all-polymer solar cells polymer acceptors planar heterojunction sequential deposition 

分 类 号：TM914.4[电气工程—电力电子与电力传动]