Jianqiu Wang, Zhong Zheng,* Pengqing Bi, Zhihao Chen, Yafei Wang, Xiaoyu Liu, Shaoqing Zhang, Xiaotao Hao, Maojie Zhang,* Yongfang Li and Jianhui Hou*

National Science Review, 2023, 10, nwad085.

Large voltage losses are the main obstacle for achieving high efficiency in organic solar cells (OSCs). Here, we reduce the voltage losses and improve the PCE of OSCs by introducing an asymmetric small molecule acceptor (SMA) AITC as the third component into high-performance PBDB-TCl:BTP-eC9 binary blends. As expected, the addition of AITC reinforces the molecular packing and tunes the domain size. Consequently, we suppress charge recombination, expedites hole transfer and nahhows down energetic disorder and electronic density of state in active layer. Due to the improvements in comprehensive performance, the ternary OSCs exhibit a high fill factor (FF) of 80.5% and a high V_OC of 0.88 V with the significantly reduced ΔV_3, an enormously boosted PCE of 19.1% (certified as 18.9%) is achieved. In addition, the ternary blend is used as active layer of sub-cell in tandem cells and output a recorded PCE of 20.6% (certified as 20.3%), which is the highest value for OSCs till date.

文章链接：https://academic.oup.com/nsr/article/10/6/nwad085/7095866