Recent progress of PM6:Y6-based high efficiency organic solar cells

Fused-ring non-fullerene electron-accepting materials have been well designed and synthesized to adopt into the high-efficiency organic solar cells (OSCs). Y6, as an epoch-making non-fullerene acceptor (NFA), remarkably promoted the power conversion efficiency (PCE) over 18% in 2020. After then, Y6-based OSCs enjoy a rapid growth in both the device performance and fundamental studies. In this review, we systematically summarize the recent progress of PM6:Y6-based high efficiency OSCs. This review will appeal to a wide scientific community and help researchers understand the achievements, challenges, and future direction of the PM6:Y6-based high efficiency OSCs.