Small molecule acceptors with a ladder-like core for high-performance organic solar cells with low non-radiative energy losses. Yunzhi Wang,  Zhongwei Liu, Xinyue Cui, Chu Wang, Hao Lu, Yahui Liu,  Zhuping Fei,  Zaifei Ma, and Zhishan Bo. Journal of Materials Chemistry A, 8, 12495-12501 (2020)