Novel A-D-A type small molecules with β-alkynylated BODIPY flanks for bulk heterojunction solar cells

Four A-D-A type BODIPY derivatives with ethinyl bridges were designed and synthesized for small molecule organic solar cells (SM-OSCs). All these molecules show appealing photovoltaic performance. Among them, B-BDP/PC71BM based OSC exhibit not only good photoelectric characteristic but also superior charge transport property and favorable nanoscale morphology relative to the other counterparts and thus pronounce to a higher PCE of 4.65% with a Jsc of 11.84 mA cm2 and a FF of 53.8%, which is one of the best values in BODIPY based OSCs.310