Enhanced performance of double perovskite solar cell using WO3 as an electron transport material.

In this study, halide double perovskite (FA)₂BiCuI₆ is used as a light-harvesting layer for device structure FTO/WO₃/(FA)₂BiCuI₆/Zn₂P₃/Pd. The device unveils best photovoltaic performance having fill factor (FF) of 78.54% and power conversion efficiency (PCE) of 19.89%. The double perovskite solar cell configuration FTO/WO₃/(FA)₂BiCuI₆/Zn₂P₃/Pd is modeled further for optimum input specification of absorber layer. The most favorable absorber layer's thickness and defect density of (FA)₂BiCuI₆ layer are 0.7 µm and 1.0 × 10¹³ cm⁻³, respectively. The variation in temperature is made in the range of 300 to 480 K, and it has been observed that at 300 K temperature solar cell performance is enhanced. For maximum performance, device framework works on series resistance of 3 Ω cm and shunt resistance of 8000 Ω cm². The estimation of optimum parameters of device input is done by the SCAPS-1D tool. Optimization of the device framework is done, and palladium (Pd) is used instead of popular back contact metal gold (Au). The results obtained for the proposed double perovskites solar cell (DPSC) show improved performance from the earlier reported work. [ABSTRACT FROM AUTHOR]