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Asymmetric Alkoxy and Alkyl Substitution on Nonfullerene Acceptors Enabling High‐Performance Organic Solar Cells

Yuzhong ChenHong Kong University of Science and Technology‐Shenzhen Research Institute No. 9 Yuexing first RD, Hi‐tech Park, Nanshan Shenzhen 518057 P. R. ChinaFujin BaiDepartment of Chemistry Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials Energy Institute 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 KongZhengxing PengDepartment of Physics and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University Raleigh NC 27695 USALei ZhuSchool of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaJianquan ZhangInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology (SCUT) Guangzhou 510640 P. R. ChinaXinhui ZouHong Kong University of Science and Technology‐Shenzhen Research Institute No. 9 Yuexing first RD, Hi‐tech Park, Nanshan Shenzhen 518057 P. R. ChinaYunpeng QinDepartment of Physics and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University Raleigh NC 27695 USAHa Kyung KimHong Kong University of Science and Technology‐Shenzhen Research Institute No. 9 Yuexing first RD, Hi‐tech Park, Nanshan Shenzhen 518057 P. R. ChinaJun YuanCollege of Chemistry and Chemical Engineering Central South University Changsha 410083 P. R. ChinaLik‐Kuen MaHong Kong University of Science and Technology‐Shenzhen Research Institute No. 9 Yuexing first RD, Hi‐tech Park, Nanshan Shenzhen 518057 P. R. ChinaJie ZhangDepartment of Chemistry Guangdong‐Hong Kong‐Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials Energy Institute 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 KongHan YuUniversity of Hong KongPhilip C. Y. ChowHong Kong University of Science and Technology‐Shenzhen Research Institute No. 9 Yuexing first RD, Hi‐tech Park, Nanshan Shenzhen 518057 P. R. ChinaFei HuangInstitute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology (SCUT) Guangzhou 510640 P. R. ChinaYingping ZouCollege of Chemistry and Chemical Engineering Central South University Changsha 410083 P. R. ChinaHarald AdeDepartment of Physics and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University Raleigh NC 27695 USAFeng LiuSchool of Physics and Astronomy and Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Shanghai 200240 P. R. ChinaHe YanHong Kong University of Science and Technology‐Shenzhen Research Institute No. 9 Yuexing first RD, Hi‐tech Park, Nanshan Shenzhen 518057 P. R. China

2020en

Ochiq kirish: yoʻq

ABI

Annotatsiya

Abstract In this paper, a strategy of asymmetric alkyl and alkoxy substitution is applied to state‐of‐the‐art Y‐series nonfullerene acceptors (NFAs), and it achieves great performance in organic solar cell (OSC) devices. Since alkoxy groups can have a significant influence on the material properties of NFAs, alkoxy substitution is applied to the Y6 molecule in a symmetric manner. The resulting molecule (named Y6‐2O), despite showing improved open‐circuit voltage ( V oc ), yields extremely poor performance due to low solubility and excessive aggregation properties, a change that is due to the conformational locking effect of alkoxy groups. In contrast, asymmetric alkyl and alkoxy substitution on Y6, yields a molecule named Y6‐1O that can maintain the positive effect of V oc improvement and obtain reasonably good solubility. The resulting molecule Y6‐1O enables highly efficient nonfullerene OSCs with 17.6% efficiency and the asymmetric side‐chain strategy has the potential to be applied to other NFA‐material systems to further improve their performance.

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DOI: 10.1002/aenm.202003141

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