Rhodanine flanked indacenodithiophene as non-fullerene acceptor for efficient polymer solar cells

• Published in: Science China. Chemistry 2017-02, Vol.60 (2), p.257-263
• Main Authors: Jia, Boyu, Wu, Yao, Zhao, Fuwen, Yan, Cenqi, Zhu, Siya, Cheng, Pei, Mai, Jiangquan, Lau, Tsz-Ki, Lu, Xinhui, Su, Chun-Jen, Wang, Chunru, Zhan, Xiaowei
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Electron mobility; Electrons; Energy; Energy conversion efficiency; Fullerenes; LUMO; Molecular orbitals; Open circuit voltage; Photovoltaic cells; Polymers; Solar cells; Steric hindrance; 分子轨道; 富勒烯; 有机太阳能电池; 电子受体; 罗丹宁; 聚合物; 苯并噻二唑
• ISSN: 1674-7291; 1869-1870
• DOI: 10.1007/s11426-016-0336-6

A fused-ring electron acceptor IDT-2BR1 based on indacenodithiophene core with hexyl side-chains flanked by benzothiadiazole rhodanine was designed and synthesized.In comparison with its counterpart with hexylphenyl side-chains（IDT-2BR）,IDT-2BR1exhibits higher highest occupied molecular orbital（HOMO）energy but similar lowest unoccupied molecular orbital（LUMO）energy（IDT-2BR1：HOMO=-5.37eV,LUMO=-3.67eV;IDT-2BR：HOMO=-5.52eV,LUMO=-3.69eV）,red-shifted absorption and narrower bandgap.IDT-2BR1 has higher electron mobility（2.2×10^-3 cm^2 V^-1 s^-1 ）than IDT-2BR（3.4×10^-4 cm^2 V^-1 s^-1 ）due to the reduced steric hindrance and ordered molecular packing.Fullerene-free organic solar cells based on PTB7-Th：IDT-2BRl yield power conversion efficiencies up to 8.7%,higher than that of PTB7-Th：IDT-2BR（7.7%）,with a high open circuit voltage of0.95 V and good device stability.