LAUSR

Abstract Lead halide perovskite solar cells (LHPSC) are of great potential for commercial application with conversion efficiency exceeding 20%. But the toxic nature of lead, fabrication of perovskite solar cell is still not considered for commercial applications. Methylammonium tin halide perovskite ( M A S n I 3 ) is being used as an alternate absorber layer for replacement of LHPSC but the power conversion efficiency (PCE) achieved from M A S n I 3 solar cell is still far less from LHPSC. To investigate the limitation of M A S n I 3 solar cell performance numerical analysis was performed. For device modeling different electron transport layer (ETL) and methylammonium tin halide ( M A S n B r 3 ) as hole transport layer (HTL) was used. From analysis it was revealed that open circuit voltage ( V 0 c ), short cicuit current ( J s c ), fill factor ( F F ) and P C E are highly depended on ETL conduction band offset ( C B O ) between ETL/Absorber ( M A S n I 3 ) interface, thickness of ETL and donor doping concentration of ETL. With + C B O at junction a “cliff” is formed at the interface, this leads to high interface recombination because of built in potential to separate charge carriers. In contrast to - C B O a “spike” suppress interface recombination but a larger value of spike will lead to degradation of device performance. For selection of ETL, a moderate value of - C B O is required and this is achieved by changing elemental composition of ETL alloy materials ( C d 1 - x Z n x S , Z n S 1 - x O x ). These materials are expected to provide higher conversion efficiency for M A S n I 3 solar cell. A novel concept in numerical modeling is presented which will categorically offer new direction for the fabrication of high efficiency photovoltaic devices.