An asymmetric small molecule acceptor for organic solar cells with a short circuit current density over 24 mA cm−2

Acceptor Y22 with an asymmetric hexacyclic A–DA′D–A structure achieved a high PCE of 15.4% and a high J_sc of 24.37 mA cm⁻², which are among the best values reported for asymmetric acceptor based binary organic solar cells.