Comparison of Linear- and Star-Shaped Fused-Ring Electron Acceptors

被引:45
作者
Cai, Guilong [1 ,2 ]
Wang, Wei [2 ]
Zhou, Jiadong [3 ]
Xiao, Yiqun [4 ]
Liu, Kuan [2 ]
Xie, Zengqi [3 ]
Lu, Xinhui [4 ]
Lian, Jiarong [1 ]
Zeng, Pengju [1 ]
Wang, Yiping [1 ]
Zhan, Xiaowei [2 ]
机构
[1] Shenzhen Univ, Coll Phys & Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst, Shenzhen 518060, Peoples R China
[2] Peking Univ, Coll Engn, Dept Mat Sci & Engn, Key Lab Polymer Chem & Phys,Minist Educ, Beijing 100871, Peoples R China
[3] South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China
[4] Chinese Univ Hong Kong, Dept Phys, Hong Kong 999077, Peoples R China
来源
ACS MATERIALS LETTERS | 2019年 / 1卷 / 03期
关键词
ORGANIC SOLAR-CELLS; NON-FULLERENE ACCEPTOR; POLYMER; EFFICIENT; CORE; LAYER;
D O I
10.1021/acsmaterialslett.9b00253
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A star-shaped nonfullerene electron acceptor, FBTIC, and a linear-shaped nonfullerene acceptor, FBDIC, with the same electron-deficient end groups and p-hexylphenyl side chains but different fused-ring electron-rich cores (benzotrithiophene and benzodithiophene) are designed, synthesized, and compared. Terminal groups 2FIC in FBTIC form intermolecular pi-pi stacking, leading to the complex 3D conjugated framework, while 2FIC units in FBDIC form double hydrogen bonding. Relative to that of FBDIC, FBTIC shows an 81 nm blue-shifted absorption, a 0.21 eV larger optical bandgap, a 0.13 eV lower highest occupied molecular orbital, a 0.1 eV higher lowest unoccupied molecular orbital, and double electron mobility. Paired with the donor PM6, the optimized PM6/FBDIC-based organic photovoltaic cells show an efficiency of 12.3%, while the cells based on PM6/FBTIC exhibit an efficiency of 10.1% with a fill factor of 75.4%, much better than those of the reported star-shaped fused-ring electron acceptors.
引用
收藏
页码:367 / 374
页数:15
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