Bi, Zhaozhao, Naveed, Hafiz Bilal, Sui, Xinyu, Zhu, Qinglian, Xu, Xianbin, Gou, Lu, Liu, Yanfeng, Zhou, Ke, Zhang, Lei, Zhang, Fengling, Liu, Xinfeng, Ma, Wei, Bi, Zhaozhao, Naveed, Hafiz Bilal, Sui, Xinyu, Zhu, Qinglian, Xu, Xianbin, Gou, Lu, Liu, Yanfeng, Zhou, Ke, Zhang, Lei, Zhang, Fengling, Liu, Xinfeng, and Ma, Wei
Fullerene derivative (PC71BM) and high crystallinity molecule (DR3TBDTT) are employed into PTB7-Th:FOIC based organic solar cells (OSCs) to cooperate an individual nanostructure optimized quaternary blend. PC71BM functions as molecular adjuster and phase modifier promoting FOIC forming "head-to-head" molecular packing and neutralizing the excessive FOIC crystallites. A multi-scale modified morphology is present thanks to the mixture of FOIC and PC71BM while DR3TBDTT disperses into PTB7-Th matrix to reinforce donors crystal-linity and enhance domain purity. Morphology characterization highlights the importance of individually optimizated nanostructures for donor and acceptor, which contributes to efficient hole and electron transport toward improved carrier mobilities and suppressed non-geminated recombination. Therefore, a power conversion efficiency of 13.51% is realized for a quaternary device which is 16% higher than the binary device (PTB7-Th:FOIC). This work demonstrates that utilizing quaternary strategy for simultaneous optimization of donor and acceptor phases is a feasible way to realize high efficient OSCs., Funding Agencies|Ministry of science and technologyMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [2016YFA0200700]; NSFCNational Natural Science Foundation of China [21704082, 21875182, 21534003]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2017M623162]; 111 project 2.0 [BP2018008]; Office of Science, Office of Basic Energy Sciences, of the U.S. Department of EnergyUnited States Department of Energy (DOE) [DE-AC02-05CH11231]