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

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 (FA 0.83 Cs 0.17 PbI 3-x Br x ) 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 FA 0.83 Cs 0.17 PbI 3-x Br x 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 FA 0.83 Cs 0.17 PbI 3-x Br x as an active layer in this paper. It has been demonstrated that when halogen ratios increase, power conversion efficiency (PCE), short-circuit current density (J SC ), and fill factor (FF) decrease while open-circuit voltage (V OC ) increases. We have discovered that, among all the combinations, FA 0.83 Cs 0.17 PbI 2.5 Br 0.5 has the highest efficiency of 23.57% after considering perovskite thickness, defect density, series resistance, and shunt resistance. Finally, we can say that FA 0.83 Cs 0.17 PbI 2.5 Br 0.5 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. • Analyze the performance and characteristics of Cesium formamidinium lead mixed halide (FA 0.83 Cs 0.17 PbI 3-x Br x ) based perovskite solar cells for different I/Br ratios. • The effect of various PSC key parameters such as perovskite layer thickness, absorber defect density, interface defect density, shunt resistance, and series resistance is observed. • At 169 nm perovskite layer thickness, FA 0.83 Cs 0.17 PbI 0.5 Br 2.5 has the greatest PCE value of 22.89%. • The optimum bulk defect density is 10 13 . Materials that contain low Bromine experienced a sharp decrease with the increase of defects. • In the range of 4000 Ωcm 2 shunt resistance, PCE has the maximum value of 21.82% for FA 0.83 Cs 0.17 PbI 0.5 Br 2.5 . • In the region of 1 Ωcm 2 series resistance, PCE has the maximum value of 22.67% for FA 0.83 Cs 0.17 PbI 0.5 Br 2.5 .