Performance investigation of cesium formamidinium lead mixed halide (FA0.83Cs0.17PbI3-xBrx) for different iodine and bromine ratios

Abstract

In recent years, lead mixed halide perovskite materials have been highly efficient in solar cells and other semiconductor technology. Presently, Perovskites solar cells combined with Cesium formamidinium lead mixed halide (FA0.83Cs0.17PbI3-xBrx) are the most widely discussed subject for third-generation solar cells studied among third-generation solar cells in light of their tunable broad bandgap, strong charge carrier mobility, and high efficiency. The perovskite active layers with the hybrid perovskite composition of FA0.83Cs0.17PbI3-xBrx can change bandgap by adjusting the I/Br ratio ranging (x = 0.5, 1.0, 1.5, 2.0, 2.5). We have utilized SCAPS-1D to simulate an n-i-p planer heterojunction PSC by changing the I/Br ratio of FA0.83Cs0.17PbI3-xBrx as an active layer in this paper. It has been demonstrated that when halogen ratios increase, power conversion efficiency (PCE), short-circuit current density (JSC), and fill factor (FF) decrease while open-circuit voltage (VOC) increases. We have discovered that, among all the combinations, FA0.83Cs0.17PbI2.5Br0.5 has the highest efficiency of 23.57% after considering perovskite thickness, defect density, series resistance, and shunt resistance. Finally, we can say that FA0.83Cs0.17PbI2.5Br0.5 as an absorbing perovskite material may generate a high-efficiency solar cell while also performing the role of the top cell in a perovskite-perovskite tandem arrangement.