Asymmetrical Ladder‐Type Donor‐Induced Polar Small Molecule Acceptor to Promote Fill Factors Approaching 77% for High‐Performance Nonfullerene Polymer Solar Cells
Wei Gao(Shenzhen University), Miao Zhang(Beijing Jiaotong University), Tao Liu(Hong Kong University of Science and Technology), Ruijie Ming(Wuhan University), Qiaoshi An(Beijing Jiaotong University), Kailong Wu(Wuhan University), Dongjun Xie(Wuhan University), Zhenghui Luo(Wuhan University), Cheng Zhong(Wuhan University), Feng Liu(Shanghai Jiao Tong University), Fujun Zhang(Beijing Jiaotong University), He Yan(Hong Kong University of Science and Technology), Chuluo Yang(Shenzhen University)
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Abstract
In this work, an effectual strategy of constructing polar small molecule acceptors (SMAs) to promote fill factor (FF) of nonfullerene polymer solar cells (PSCs) is first reported. Three asymmetrical SMAs of IDT6CN, IDT6CN-Th, and IDT6CN-M, which own large dipole moments, are designed and synthesized. The PSCs based on three polar SMAs exhibit apparently higher FFs compared with their symmetrical analogues. The asymmetrical design strategy accompanied with side chain and end group engineering makes IDT6CN-Th- and IDT6CN-M-based nonfullerene PSCs achieve high power conversion efficiency with FFs approaching 77%.
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