Optimizing Performance of Mixed Halide Perovskite MA0.61FA0.37Cs0.02PbI2.88Br0.12 based Solar Cells through Thickness and Defect Density: A Simulation Study

The study aims to investigate the effect of altering thickness and bulk defect density (BDD) of the perovskite layer on the photovoltaic (PV) parameters of the nuclear driven perovskite (NDPVK) based solar cell. According to simulation results, increasing the thickness of the NDPVK layer up to 400 nm enhances the cell's overall performance, leading to an increase in J
SC
. However, going beyond this thickness causes recombination rates to rise, resulting in decreased performance and PV parameters. Additionally, the research demonstrates that an increase in BDD causes a decrease in the cell's EQE, JSC, and FF, while the lowest BDD leads to the best overall performance. The results underscore the significant impact of having a high perovskite layer thickness and a low bulk defect density on the performance of NDPVK cells. Finally, the optimized device has enhanced PV parameters, including V
OC
-1.22V, J
SC
-21.235 mA/cm
²
, FF- 74.96 %, and PCE-15.89 %.