A Low Reorganization Energy and Two-dimensional Acceptor with Four End Units for Organic Solar Cells with Low E-loss
By:
Chen, HB (Chen, Hongbin) [1] , [2] , [3] ;
Cao, XJ (Cao, Xiangjian) [1] , [2] , [3] ;
Xu, XY (Xu, Xiaoyun) [4] ;
Li, CX (Li, Chenxi) [1] , [2] , [3] ;
Wan, XJ (Wan, Xiangjian) [1] , [2] , [3] ;
Yao, ZY (Yao, Zhaoyang) [1] , [2] , [3] ;
Chen, YS (Chen, Yongsheng) [1] , [2] , [3]
CHINESE JOURNAL OF POLYMER SCIENCE, 2022, 40(8): 921-927
DOI
10.1007/s10118-022-2730-4
Abstract
A novel two-dimensional A-D-A acceptor named as CH8 with four electron-withdrawing end units has been successfully designed and synthesized. The enlarged conjugation in two directions renders CH8 exhibit an extremely low electron reorganization energy of 98 meV, which makes CH8 a potential candidate for outstanding organic semiconductor material. When blended with PM6, a considerate power conversion efficiency of 9.37% along with a high open-circuit voltage (V-oc) 0.889 V and low energy loss (E-loss) below 0.6 eV is achieved. These results indicate that the two-dimensional A-D-A molecule with four electron-withdrawing end units is an effective molecular design strategy to achieve lower voltage loss and also possible high performance for organic photovoltaics if ideal morphology could be achieved.