An acceptor with an asymmetric and extended conjugated backbone for high-efficiency organic solar cells with low nonradiative energy loss
By:
Wang, J (Wang, Jing) [1] ;
Chen, HB (Chen, Hongbin) [2] ;
Xu, XY (Xu, Xiaoyun) [3] ;
Ma, ZF (Ma, Zaifei) [3] ;
Zhang, Z (Zhang, Zhe) [2] ;
Li, CX (Li, Chenxi) [2] ;
Yang, Y (Yang, Yang) [4] ;
Wang, J (Wang, Jian) [4] ;
Zhao, Y (Zhao, Yue) [5] ;
Zhang, MT (Zhang, Mingtao) [2] ;
Wan, XJ (Wan, Xiangjian) [2] ;
Lu, Y (Lu, Yan) [1] ;
Chen, YS (Chen, Yongsheng) [2]
JOURNAL OF MATERIALS CHEMISTRY A, 2022, 10(31): 16714-16721
Abstract
One of the significant factors that limit efficiencies of organic solar cells (OSCs) is their large energy loss (E-loss), especially the high nonradiative recombination energy loss (Delta E-nr). Herein, an acceptor named NQF with an asymmetric and extended conjugation central core has been designed and synthesized. Compared with Y6, NQF exhibits upshifted HOMO and LUMO energy levels and a higher photoluminescence quantum yield (PLQY). The OSC based on PM6:NQF demonstrates a Delta E-nr as low as 0.177 eV and thus a high power conversion efficiency (PCE) of 17.57%. In contrast, the control device PM6:Y6 gives a PCE of 16.45% with a Delta E-nr value of 0.231 eV. This work achieves molecular design with low Delta E-nr and demonstrates that the E-loss of OSCs can be effectively reduced through rational and delicate molecular design.
