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

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

doi:10.1002/adma.201800052

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

Adv Mater. 2018 Jun;30(26):e1800052. doi: 10.1002/adma.201800052. Epub 2018 May 15.

Authors

Wei Gao^{1

2}, Miao Zhang³, Tao Liu⁴, Ruijie Ming¹, Qiaoshi An³, Kailong Wu¹, Dongjun Xie¹, Zhenghui Luo¹, Cheng Zhong¹, Feng Liu⁵, Fujun Zhang³, He Yan⁴, Chuluo Yang^{1

2}

Affiliations

¹ Department of Chemistry, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan, 430072, P. R. China.
² Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
³ Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing, 100044, P. R. China.
⁴ Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
⁵ Department of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiaotong University, Shanghai, 200240, P. R. China.

PMID: 29766573
DOI: 10.1002/adma.201800052

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%.

Keywords: asymmetrical molecule; high fill factor; nonfullerene polymer solar cell; small molecule acceptor.