Organic solar cells based on PM6:Y7 and doped with boron-dipyrromethene (B1)

In this work, organic solar cells (OSCs) based on PM6:Y7 active layer doped with a new boron-dipyrromethene ( B1 ) at different concentrations are reported. OSCs were fabricated and tested under regular atmospheric conditions, employing the conventional structure: glass/ITO/PEDOT:PSS/PM6:Y7: B1 /PFN/FM where Field’s metal (FM), a eutectic alloy of Bi, In, and Sn served as an alternative top electrode, deposited via drop coating at 85 ºC, eliminating the requirement of a high-vacuum chamber. The PM6:Y7 (1:1.2 wt %) blend was prepared at a concentration of 20 mg/mL in anhydrous chlorobenzene, the B1 best concentration was 1 wt % (with respect to the total mass). The average reached power conversion efficiency (PCE) for 1% of B1 devices was 11.07% (best PCE = 11.82%) while for the reference devices it was 10.02% (best PCE = 10.45%), this means 10.47% of PCE enhancement over the reference OSCs. • Synthesis of the new BODIPY dimer B1 via homocoupling. • DFT calculations and geometry optimization with SMD model. • Fabrication and testing of organic solar cells (OSCs) under regular atmosphere. • B1 concentration variation at 0, 1 and 2% wt. in the PM6:Y7 blend based OSCs. • 10.47% of PCE increase over the reference OSCs with the B1 addition at 1% wt.