NUMERICAL OPTIMIZATION OF LEAD FREE PEROVSKITE SOLAR CELL

Alternative perovskite solar cells are emerging rapidly to compete with other conventional photovoltaic materials. However, toxic lead content of organic-inorganic perovskite is an issue to be addressed briefly. In this work, we propose to use organo-tin halide perovskite absorber layer to replace toxic Pb-based light harvester. We perform a numerical optimization of the layer thicknesses both from the optical and electrical points of view, using SCAPS ( Solar Cell Capacitance Simulator) and analytical calculations. We study two types of electron conducting materials ( n-ZnO and n-TiO2). Both ZnO/CH3NH3SnI3/Spiro-OMETAD and TiO2/CH3NH3SnI3/Spiro-OMETAD structures show the conversion efficiencies above 15% of ( respectively 15.44% and 15.64%). Accordingly, we present a fully optimized device architecture. The analyzed results indicate the feasible fabrication of high efficiency Pb-free perovskite solar cells.