摘要： In this work, a nonacyclic carbazole-cored electron-rich central building block called CZTT and its derivated non-fullerene acceptors (CZTT-IC and CZTT-4F) are designed and synthesized. CZTT-4F with fluorination on the accepting end groups shows significantly down-shifted energy levels and a narrower bandgap as well as a smaller dipole moment under the ground state in comparison to the counterpart CZTT-IC. In the blend films, blends of both fluorinated donor and acceptor (PM6:CZTT-4F) reveal relatively decreased miscibility resulting in better donor/acceptor interpenetrating network with higher domain purity for efficient charge transport. Organic solar cells (OSCs) based on PM6:CZTT-4F blend exhibited a highest power conversion efficiency (PCE) of 12.07% with enhanced thermal and light soaking stability. To the best of our knowledge, this performance is among the highest for carbazole-based OSCs in the literature. The results reveal that the nonacyclic CZTT core is a promising building block for constructing efficient non-fullerene acceptors. More importantly, the relatively decreased miscibility within fluorinated CZTT-based blend film is demonstrated to greatly promote the stability of OSCs.