Pyran-fused non-fullerene acceptor achieving 15.51% efficiency in organic solar cells

Despite the rapidly increasing power conversion efficiency (PCE) of organic solar cells (OSCs), the involved light-harvesting materials in excellent devices still suffer from tedious and inefficient synthesis. This creates one rather challenging issue for both further optimization in lab and large-scale production of OSCs. Herein, based on a pyran-fused backbone, an accessible and largely promising feasible non-fullerene acceptor (NFA) FOEH-2F has been designed and efficiently synthesized, which displays a much stronger near-infrared absorption and more compact molecular packing with respect to that of its control molecule F-EH-2F. As a result, OSC based on FOEH-2F affords a considerable PCE of 15.51%, the highest performance reported to date for pyran-fused NFAs.