Efficiency enhancement of perovskite solar cell devices utilizing MXene and TiO2 as an electron transport layer.

In the rapid growth of perovskite solar cells, there are still specific issues regarding the extensive absorption of incident photons. Double-layered methyl ammonium (MA)-free perovskite solar cells (PSC) have been proposed to sort out these issues. The material absorber in solar cells based on MA-free and cesium-based perovskite, i.e., Cs₂BiAgI₆, is a critical parameter because of its non-volatile nature as well as its band gap of 1.6 eV being helpful in a broader visible absorption spectrum than the conventional CH₃NH₃PbI₃ material. Moreover, the quantum efficiency (QE) and power conversion efficiency (PCE) in a configuration with MXene + TiO₂ as the electron transport layer (ETL) in the PSC can make improvements over a more extensive range. The results of the current modeling of numerical simulations are used to investigate the exclusive optoelectrical outputs of the PSC. Furthermore, we use a novel approach of an ETL of MXene + TiO₂ in a PSC, which will lower the manufacturing cost and defectiveness. The present work compares different ETLs to attain the best PCE using Cs₂BiAgI₆ as a perovskite absorber layer (PAL). The results are exciting as the highest open circuit voltage (V_OC) of 1.48 V, high short current density (JSC) of 22.8 mA cm^-2, with a high fill factor (FF) of nearly 84.6% in the double-layered PSC offer a high power conversion efficiency (PCE) of more than 28%. The designed outputs will be efficient for the convenient fabrication of the PSC. [ABSTRACT FROM AUTHOR]