Journal of the American Chemical Society, Vol.139, No.39, 13636-13639, 2017
Small Molecule Near-Infrared Boron Dipyrromethene Donors for Organic Tandem Solar Cells
Three furan fused boron dipyrromethenes (BODIPYs) with a CF3 group on the mesa-carbon are synthesized as near-infrared absorbing materials for vacuum processable organic solar cells. The best single junction device reaches a short-circuit current (j(sc)) of 13.3 mA cm(-2) and a :power conversion efficiency (PCE) of 6.1%. These values are highly promising for an electron donor material with an absorption onset beyond 900 nm. In a tandem solar cell comprising a NIR BODIPY subcell and a matching "green" absorber subcell, complementary absorption is achieved, resuming in PCE of similar to 10%.