Paper Title
Cerium Oxide as a Printable Electron Transporting Layer for Efficient FASnI3-Based Perovskite Solar Cells

Abstract
Fabrication of a fully screen-printed device in air ambient needs a low-temperature process for depositing all of the layers. In this study, CeO2 is proposed as a suitable ETL for fabricating low-cost and stable device at room temperature. The simulated standard device with TiO2 ETL agrees with the highest theoretical efficiency of 19.08% reported for FASnI3 based PSCs. By optimizing the defect density in the interface of TiO2/FASnI3 the efficiency of standard device calculated. The optimization of perovskite thickness using SCAPS-ID software in present study enhanced the final optimized PCE of standard device to 19.48%. Then, the effect of TiO2 replacement with CeO2 ETL revealed efficiency of modified device to 23.42%. By changing the perovskite thickness vs ETL thickness, acceptor density of FASnI3/donor density of CeO2. The results of this study offer significant insights for enhancing the efficiency of printable FASnI3 based PSCs by replacing TiO2 with CeO2 Keywords - Capture cross section of electrons; Cerium oxide; FasSnI3; Lead-free perovskite solar cell; Tin halide perovskite.