Benzo[1,2-b:4,5-b′]diselenophene-fused nonfullerene acceptors with alternative aromatic ring-based and monochlorinated end groups: a new synergistic strategy to simultaneously achieve highly efficient organic solar cells with the energy loss of 0.49 eV

The PCE of 13.68% with the E_loss of 0.49 eV were obtained, which were the highest values obtained to date in binary PSCs with monochlorinated NF-SMAs.