Development of Solution-Processed Eco-Friendly Cs₂SnI₆ Double Perovskite Thin-Film Solar Cell

This article reports a simple and efficient solution-processed method for designing stable Cs₂SnI₆ double perovskite thin film solar cells utilizing Cesium iodide and SnI₄ in a 2:1 ratio. Better crystallinity in a Cs₂SnI₆ film is typically associated with higher optical absorbance, lower carrier concentration, more carrier mobility, and improved air and thermal stability. This compound contains Sn, which is in the 4+ oxidation state, which makes it significantly more robust against oxidation. The detailed synthetic difficulties in processing these compounds in solutions are the primary concern of this study. The solar cell parameters, structural, morphological, and, optical properties of prepared Cs₂SnI₆ thin film were investigated using Netport Oriel12A solar simulator, thin film grazing incidence x-ray diffraction (GI-XRD), field emission scanning electron microscope, energy dispersive X-ray, and photoluminescence spectra (PL-Spectroscopy). Further, utilizing the synthesized Cs₂SnI₆ thin films as an absorber material, we have fabricated n-i-p configured FTO/TiO₂/Cs₂SnI₆/MoS₂/Ni/glass in the ambient condition. The current study will also suggest future research directions for increasing the device performance of air-stable Cs₂SnI₆ perovskite solar cells.