Asymmetrical Ladder‐Type Donor‐Induced Polar Small Molecule Acceptor to Promote Fill Factors Approaching 77% for High‐Performance Nonfullerene Polymer Solar Cells

• DOI: 10.1002/adma.201800052
• Publication Date: 2018-05-16T06:55:32Z
• Authors: Wei Gao; Miao Zhang; Tao Liu; Ruijie Ming; Qiaoshi An; Kailong Wu; Dongjun Xie; Zhenghui Luo; Cheng Zhong; Feng Liu; Fujun Zhang; He Yan; Chuluo Yang
• Keywords: Acceptor; Side chain

In this work, an effectual strategy of constructing polar small molecule acceptors (SMAs) to promote fill factor (FF) nonfullerene polymer solar cells (PSCs) is first reported. Three asymmetrical SMAs IDT6CN, IDT6CN-Th, and IDT6CN-M, which own large dipole moments, are designed synthesized. The PSCs based on three exhibit apparently higher FFs compared with their symmetrical analogues. design accompanied side chain end group engineering makes IDT6CN-Th- IDT6CN-M-based achieve high power conversion efficiency approaching 77%.