Side chain engineering investigation of non-fullerene acceptors for photovoltaic device with efficiency over 15%  

作　　者：Xin Zhang Yunqian Ding Huanran Feng Huanhuan Gao Xin Ke Hongtao Zhang Chenxi Li Xiangjian Wan Yongsheng Chen 

机构地区：[1]The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials,Institute of Polymer Chemistry,College of Chemistry,Nankai University,Tianjin 300071,China [2]School of Materials Science and Engineering,National Institute for Advanced Materials,Nankai University,Tianjin 300350,China [3]State Key Laboratory of Elemento-Organic Chemistry,Nankai University,Tianjin 300071,China [4]Renewable Energy Conversion and Storage Center(RECAST),Nankai University,Tianjin 300071,China

出　　处：《Science China Chemistry》2020年第12期1799-1806,共8页中国科学（化学英文版）

基　　金：This work was supported by the Ministry of Science and Technology of China(2019YFA0705900);the National Natural Science Foundation of China(51773095,21935007,51873089);the Natural Science Foundation of Tianjin City(17JCJQJC44500);the Program of Introducing Talents of Discipline to Universities of China(111 Project)(B12015);The authors also thank the staff from Beijing Synchrotron Radiation Facility(BSRF)for the support of 2D-GIWAXS measurements.

摘　　要：Side chain engineering plays a substantial role for high-performance organic solar cells (OSCs).Herein,a series of non-fullerene acceptor (NFA) molecules with A-D-A structures,TTCn-4F,with gradient substituent lengths of terminal side chains (T-SCs) on the molecular backbones have been designed and synthesized.The effects of T-SCs length,ranging from hydrogen atom to n-dodecyl,their optoelectronic properties,thin film molecular packing,blend film morphology,and overall photovoltaic performance have been systematically studied.The results show that among this series of molecules,TTC8-4F with n-octyl substituent,showed the best photovoltaic performance when applied with PM6 as the donor due to its favorable morphology,balanced charge mobility,effective exciton dissociation and less charge recombination.Based on this,its ternary device with F-Br as the secondary acceptor achieved a high PCE of 15.34%with the simultaneously enhanced Voc of 0.938 V,Jscof 22.66 mA cm^-2,and FF of 72.15%.These results indicate that the engineering of T-SCs is an effective strategy for designing high-performance NFAs.

关 键 词：organic solar cells non-fullerene acceptor side chains 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]