Toward high-efficiency photovoltaics: MASnI3 and FASnI3 double absorber perovskite solar cells with optimized conversion efficiency of 28 %

Due to their properties and optimal bandgap values, MASnl₃ and FASnl₃ have been chosen as absorber materials to enhance charge separation efficiency and light absorption by working together collaboratively. FASnI₃, with a bandgap of 1.41 eV, increases photon utilization and widens the spectral coverage range, while MASnl₃, with a bandgap of 1.30 eV, serves as the primary absorber. Absorbers enhance performance by effectively capturing a broader range of incoming spectra. This study extensively examines MASnl₃ and FASnl₃ double absorber perovskite solar cells through simulations. This research delves into how the thickness of the absorber layer and doping thickness affect the performance of cells by assessing bulk trap density levels well. The optimal configuration is achieved by having PCE = 28.06 %, V_OC = 1.07 V, J_SC = 30.74 mA/cm² and FF = 85.23 % with a 500 nm thickness of MASnI₃ and a 300 nm thickness of FASnI₃. Furthermore, diminishing bulk and interfacial defect densities significantly improves the device's performance. These results show that solar cells based on MASnl₃ and FASnl₃ have the potential for use in solar power technology advancements, both in experiments and commercial applications, in the future.