X-ray Investigation of CsPbI(3):EuCl(3) Infiltrated into Gig-Lox TiO(2) Spongy Layers for Perovskite Solar Cells Applications

In this study, we explore the potential of a blended material comprising [Formula: see text]: [Formula: see text] perovskite and Gig-Lox [Formula: see text] , a unique transparent spongy material known for its multi-branched porous structure, for application in solar cells. The inclusion of [Formula: see text] in [Formula: see text] serves to stabilize the photoactive [Formula: see text]-phase with a bandgap of 1.75 eV, making it suitable for solar energy conversion in tandem solar cells. Our study applies X-ray-based techniques to investigate the structural properties and interfacial behavior within this blended material, in comparison with a reference perovskite layer deposited on glass. In addition, Spectroscopic ellipsometry is complemented with density functional theory calculations and photoluminescence measurements to elucidate the absorption and radiative emission properties of the blend. Notably, our findings reveal a significant quenching of photoluminescence within the blended material, underscoring the pivotal role of the distributed interfaces in facilitating efficient carrier injection from the [Formula: see text]: [Formula: see text] perovskite into the Gig-Lox [Formula: see text] sponge. These findings pave the way for the application of the blend as an Electron Transport Layer (ETL) in semi-transparent perovskite solar cells for tandem and building integrated photovoltaics.