Publication

Abstract : This manuscript introduces a novel design of Methylammonium Antimony Iodide (Ma3Sb2I9) and Cesium Bismuth Iodide (Cs3Bi2I9) based dual light harvester (absorber) composition to form an Au/Cu:NiO/Ma3Sb2I9/Cs3Bi2I9/FTO/ZnO multi-heterojunction photovoltaic perovskite cell (PVPC) architecture. The optimized parameters coupled with appropriately aligned energy levels of the proposed Cs3Bi2I9- Ma3Sb2I9 dual light harvesting absorber composition significantly augments optical absorption and reduce recombination losses. The essential electrical properties and structural dimensions of the perovskite absorber of the presented photovoltaic perovskite cell (PVPC) configuration have been meticulously optimized using the one-dimensional SCAPS simulator. A notable optoelectronic power conversion efficiency (OPCE) of 25.5%, an open-circuit voltage (Voc) of 1.357 V, a fill factor (FF) of 87.01% and a short-circuit current density (Jsc) of 22.08 mA/cm2 is extracted through AM 1.5 photovoltaic illumination. The integration of dual-light harvesting (absorber) architecture, comprising Cs3Bi2I9 and Ma3Sb2I9 materials, notably demonstrates significantly enhanced quantum efficiency (QE) and expanded spectral coverage at quintessential values, surpassing the performance of either material used independently as single absorbers. A highest quantum efficiency (QE) of ∼ 83% encompassing across a spectral window of 300–850 nm is achieved. This surpasses the 81% quantum efficiency attained by an individual Cs3Bi2I9 absorber, which is constrained to a spectral window of 300–630 nm. Also, it exceeds the 45% quantum efficiency attained by the individual Ma3Sb2I9 absorber, which operates within the spectral coverage of 300–850 nm.