50% Sn-Based Planar Perovskite Solar Cell with Power Conversion Efficiency up to 13.6%

In the present work, a Pb-assisted two step method is successfully proposed to fabricate high-quality CH3NH3Sn0.5Pb0.5I3 (MASn0.5Pb0.5I3) perovskite film on the indium tin oxide (ITO) glass/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) substrate. The film shows regular crystalline grains with a flat and compact morphology as well as full coverage on the planar PEDOT:PSS substrate. Remarkably, corresponding devices ITO/PEDOT:PSS/MASn0.5Pb0.5I3/C60/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline/Ag are fabricated with high reproducibility, achieving a high power conversion efficiency of 13.6%, which is, to the best of knowledge, the most efficient solar cell based on Sn-based perovskite.