Conjugated Extension of Non-Fullerene Acceptors Enables Efficient Organic Solar Cells with Optoelectronic Response over 1000 nm
By:
Zhou, BL (Zhou, Bailin) [1] , [2] , [3] ;
Zou, YL (Zou, Yalu) [1] , [2] , [3] ;
Yi, YQQ (Yi, Yuan-Qu-Qang) [4] ;
Li, ZX (Li, Zhixiang) [1] , [2] , [3] ;
Long, GK (Long, Guankui) [5] ;
Yang, Y (Yang, Yang) [6] ;
Wang, J (Wang, Jian) [6] ;
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]
DOI
10.1021/acsaem.2c00092
Abstract
The efficient near-infrared response of light-active materials is one of the prerequisites for the most advanced organic solar cells (OSCs). Two benzodithiophene fused-ring cores (BT-4T and DBT-4T), featured with stepwise enlarged conjugations and improved electron-donor characteristics, are designed and used as the central donor units for the construction of acceptor-donor-acceptor-type molecules ZB8 and ZB10. The significantly enhanced intramolecular charge transfer endows ZB8- and ZB10-based OSCs with a photoelectronic response over 1000 nm. With more favorable molecular energy levels and an asymmetric configuration, ZB8-based best OSCs afford a 12.30% power conversion efficiency, better than that of 11.08% for the ZB10-based one. Our successful exploration for electron-rich fused-ring cores provides a quite rare but promising platform for highly efficient OSCs with a photoelectronic response over 1000 nm.
