The effects of the side-chain length of non-fullerene acceptors on their performance in all-small-molecule organic solar cells
By:
Huang, FF (Huang, Fangfang) [1] , [2] , [3] ;
Meng, LX (Meng, Lingxian) [1] , [2] , [3] ;
Jiang, CZ (Jiang, Changzun) [1] , [2] , [3] ;
Liang, HZ (Liang, Huazhe) [1] , [2] , [3] ;
Yang, Y (Yang, Yang) [4] ;
Wang, J (Wang, Jian) [4] ;
Wan, XJ (Wan, Xiangjian) [1] , [2] , [3] ;
Li, CX (Li, Chenxi) [1] , [2] , [3] ;
Yao, ZY (Yao, Zhaoyang) [1] , [2] , [3] ;
Chen, YS (Chen, Yongsheng) [1] , [2] , [3]
JOURNAL OF MATERIALS CHEMISTRY C, 2022
Abstract
A series of acceptor-donor-acceptor type non-fullerene acceptors (NFAs), FCn-2Cl, with gradient substitution lengths of side chains (SCs) on molecular backbones, have been designed and synthesized for all-small-molecule organic solar cells (ASM-OSCs). The effects of SC length ranging from n-butyl to n-dodecyl on their optoelectronic properties, molecular packing, blend film morphology and overall photovoltaic performance have been systematically studied. Our results show that the BSFTR:FC10-2Cl-based ASM-OSC exhibited the best power conversion efficiency of over 12% due to its more efficient exciton dissociation, less charge recombination, balanced charge mobility and favorable morphology. Our work highlights the importance of fine-tuning the length of SCs of NFAs for further improving the performance of ASM-OSCs.
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