The Analysis of Defect Structure of Sn-based Perovskite Solar Cell Materials Using First-principles Calculations

While Sn-based perovskite solar cells have photoelectronic properties comparable to those of lead halide perovskites, their low photoelectric conversion efficiency is a problem. The main cause of this problem is the defect level caused by the presence of defects in the crystal. In this study, we analyzed the defect structures in FASnI3 and MASnI3 perovskites using first-principles calculations and focused on the correlation between the photoelectric conversion efficiency and defect levels.